diff --git a/composer.json b/composer.json
index f615e63de423f1de1997f3bdbe5b9517d90a8d51..c767f37f3ba109f6c860e3d98c0bea2f39cf8cf7 100644
--- a/composer.json
+++ b/composer.json
@@ -106,8 +106,6 @@
 		"typo3/cms-fluid-styled-content": "self.version",
 		"typo3/cms-form": "self.version",
 		"typo3/cms-frontend": "self.version",
-		"typo3/cms-func": "self.version",
-		"typo3/cms-func-wizards": "self.version",
 		"typo3/cms-impexp": "self.version",
 		"typo3/cms-indexed-search": "self.version",
 		"typo3/cms-info": "self.version",
@@ -154,7 +152,6 @@
 			"TYPO3\\CMS\\FluidStyledContent\\": "typo3/sysext/fluid_styled_content/Classes/",
 			"TYPO3\\CMS\\Form\\": "typo3/sysext/form/Classes/",
 			"TYPO3\\CMS\\Frontend\\": "typo3/sysext/frontend/Classes/",
-			"TYPO3\\CMS\\Func\\": "typo3/sysext/func/Classes/",
 			"TYPO3\\CMS\\Impexp\\": "typo3/sysext/impexp/Classes/",
 			"TYPO3\\CMS\\IndexedSearch\\": "typo3/sysext/indexed_search/Classes/",
 			"TYPO3\\CMS\\IndexedSearchMysql\\": "typo3/sysext/indexed_search_mysql/Classes/",
diff --git a/composer.lock b/composer.lock
index 989b1ce61034db23167ff1e28253fa3e3c441eec..b70b946fd71d2c3d570fab261d657a1c3a96b783 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "content-hash": "ba4bebe7fcec50b689f276105864ae12",
+    "content-hash": "c18ec8225643a1e9e1aae0108629cd38",
     "packages": [
         {
             "name": "cogpowered/finediff",
diff --git a/typo3/sysext/core/Documentation/Changelog/master/Breaking-81787-DropEXTfunc.rst b/typo3/sysext/core/Documentation/Changelog/master/Breaking-81787-DropEXTfunc.rst
new file mode 100644
index 0000000000000000000000000000000000000000..e88d7315db7a5d2fa8f860c4d722df576761dbd8
--- /dev/null
+++ b/typo3/sysext/core/Documentation/Changelog/master/Breaking-81787-DropEXTfunc.rst
@@ -0,0 +1,35 @@
+.. include:: ../../Includes.txt
+
+================================
+Breaking: #81787 - Drop EXT:func
+================================
+
+See :issue:`81787`
+
+Description
+===========
+
+The extension :php:`func` that added the "Web->Functions" backend module
+has been dropped from core.
+
+The extension is available in the TER and an install tool upgrade wizard
+is in place to download and load the extension as compatibility layer for
+other extensions that still rely on it by adding own sub modules to the module.
+
+Extensions that need :php:`func` should already have a dependency in ext_emconf.php
+similar to this:
+
+.. code-block:: php
+
+    'constraints' => [
+        ...
+        'depends' => [
+            'func' => 9.0.0-9.0.99',
+        ],
+    ],
+
+The version constraint depends on which core version the extension supports,
+the func extension did not change much between core v8 and its extraction to TER
+in v9.
+
+.. index:: Backend, PHP-API
\ No newline at end of file
diff --git a/typo3/sysext/func/Classes/Controller/PageFunctionsController.php b/typo3/sysext/func/Classes/Controller/PageFunctionsController.php
deleted file mode 100644
index 32aa879ef659d787f4aa88ff5b3bf3cfbcba56cc..0000000000000000000000000000000000000000
--- a/typo3/sysext/func/Classes/Controller/PageFunctionsController.php
+++ /dev/null
@@ -1,257 +0,0 @@
-<?php
-namespace TYPO3\CMS\Func\Controller;
-
-/*
- * This file is part of the TYPO3 CMS project.
- *
- * It is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License, either version 2
- * of the License, or any later version.
- *
- * For the full copyright and license information, please read the
- * LICENSE.txt file that was distributed with this source code.
- *
- * The TYPO3 project - inspiring people to share!
- */
-
-use Psr\Http\Message\ResponseInterface;
-use Psr\Http\Message\ServerRequestInterface;
-use TYPO3\CMS\Backend\Template\ModuleTemplate;
-use TYPO3\CMS\Backend\Utility\BackendUtility;
-use TYPO3\CMS\Core\Imaging\Icon;
-use TYPO3\CMS\Core\Imaging\IconFactory;
-use TYPO3\CMS\Core\Utility\GeneralUtility;
-use TYPO3\CMS\Fluid\View\StandaloneView;
-use TYPO3\CMS\Fluid\ViewHelpers\Be\InfoboxViewHelper;
-
-/**
- * Script Class for the Web > Functions module
- * This class creates the framework to which other extensions can connect their sub-modules
- */
-class PageFunctionsController extends \TYPO3\CMS\Backend\Module\BaseScriptClass
-{
-    /**
-     * @var array
-     * @internal
-     */
-    public $pageinfo;
-
-    /**
-     * ModuleTemplate Container
-     *
-     * @var ModuleTemplate
-     */
-    protected $moduleTemplate;
-
-    /**
-     * Document Template Object
-     *
-     * @var \TYPO3\CMS\Backend\Template\DocumentTemplate
-     */
-    public $doc;
-
-    /**
-     * The name of the module
-     *
-     * @var string
-     */
-    protected $moduleName = 'web_func';
-
-    /**
-     * @var IconFactory
-     */
-    protected $iconFactory;
-
-    /**
-     * @var StandaloneView
-     */
-    protected $view;
-
-    /**
-     * Constructor
-     */
-    public function __construct()
-    {
-        $this->iconFactory = GeneralUtility::makeInstance(IconFactory::class);
-        $this->moduleTemplate = GeneralUtility::makeInstance(ModuleTemplate::class);
-        $this->getLanguageService()->includeLLFile('EXT:func/Resources/Private/Language/locallang_mod_web_func.xlf');
-        $this->MCONF = [
-            'name' => $this->moduleName,
-        ];
-    }
-
-    /**
-     * Injects the request object for the current request or subrequest
-     * Then checks for module functions that have hooked in, and renders menu etc.
-     *
-     * @param ServerRequestInterface $request the current request
-     * @param ResponseInterface $response
-     * @return ResponseInterface the response with the content
-     */
-    public function mainAction(ServerRequestInterface $request, ResponseInterface $response)
-    {
-        $GLOBALS['SOBE'] = $this;
-        $this->init();
-
-        // Checking for first level external objects
-        $this->checkExtObj();
-
-        // Checking second level external objects
-        $this->checkSubExtObj();
-        $this->main();
-
-        $this->moduleTemplate->setContent($this->content);
-
-        $response->getBody()->write($this->moduleTemplate->renderContent());
-        return $response;
-    }
-
-    /**
-     * Initialize module header etc and call extObjContent function
-     */
-    public function main()
-    {
-        // Access check...
-        // The page will show only if there is a valid page and if this page may be viewed by the user
-        $this->pageinfo = BackendUtility::readPageAccess($this->id, $this->perms_clause);
-        if ($this->pageinfo) {
-            $this->moduleTemplate->getDocHeaderComponent()->setMetaInformation($this->pageinfo);
-        }
-        $access = is_array($this->pageinfo);
-        // We keep this here, in case somebody relies on the old doc being here
-        $this->doc = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Backend\Template\DocumentTemplate::class);
-        // Main
-        if ($this->id && $access) {
-            // JavaScript
-            $this->moduleTemplate->addJavaScriptCode(
-                'WebFuncInLineJS',
-                'if (top.fsMod) top.fsMod.recentIds["web"] = ' . (int)$this->id . ';');
-            // Setting up the context sensitive menu:
-            $this->moduleTemplate->getPageRenderer()->loadRequireJsModule('TYPO3/CMS/Backend/ContextMenu');
-
-            $this->view = $this->getFluidTemplateObject('func', 'func');
-            $this->view->assign('moduleName', BackendUtility::getModuleUrl('web_func'));
-            $this->view->assign('id', $this->id);
-            $this->view->assign('functionMenuModuleContent', $this->getExtObjContent());
-            // Setting up the buttons and markers for docheader
-            $this->getButtons();
-            $this->generateMenu();
-            $this->content .= $this->view->render();
-        } else {
-            // If no access or if ID == zero
-            $title = $this->getLanguageService()->getLL('title');
-            $message = $this->getLanguageService()->getLL('clickAPage_content');
-            $this->view = $this->getFluidTemplateObject('func', 'func', 'InfoBox');
-            $this->view->assignMultiple([
-                'title' => $title,
-                'message' => $message,
-                'state' => InfoboxViewHelper::STATE_INFO
-            ]);
-            $this->content = $this->view->render();
-            // Setting up the buttons and markers for docheader
-            $this->getButtons();
-        }
-    }
-
-    /**
-     * Generates the menu based on $this->MOD_MENU
-     *
-     * @throws \InvalidArgumentException
-     */
-    protected function generateMenu()
-    {
-        $menu = $this->moduleTemplate->getDocHeaderComponent()->getMenuRegistry()->makeMenu();
-        $menu->setIdentifier('WebFuncJumpMenu');
-        foreach ($this->MOD_MENU['function'] as $controller => $title) {
-            $item = $menu
-                ->makeMenuItem()
-                ->setHref(
-                    BackendUtility::getModuleUrl(
-                        $this->moduleName,
-                        [
-                            'id' => $this->id,
-                            'SET' => [
-                                'function' => $controller
-                            ]
-                        ]
-                        )
-                )
-                ->setTitle($title);
-            if ($controller === $this->MOD_SETTINGS['function']) {
-                $item->setActive(true);
-            }
-            $menu->addMenuItem($item);
-        }
-        $this->moduleTemplate->getDocHeaderComponent()->getMenuRegistry()->addMenu($menu);
-    }
-
-    /**
-     * Create the panel of buttons for submitting the form or otherwise perform operations.
-     */
-    protected function getButtons()
-    {
-        $buttonBar = $this->moduleTemplate->getDocHeaderComponent()->getButtonBar();
-        // CSH
-        $cshButton = $buttonBar->makeHelpButton()
-            ->setModuleName('_MOD_web_func')
-            ->setFieldName('');
-        $buttonBar->addButton($cshButton);
-        if ($this->id && is_array($this->pageinfo)) {
-            // View page
-            $viewButton = $buttonBar->makeLinkButton()
-                ->setOnClick(BackendUtility::viewOnClick($this->pageinfo['uid'], '', BackendUtility::BEgetRootLine($this->pageinfo['uid'])))
-                ->setTitle($this->getLanguageService()->sL('LLL:EXT:lang/Resources/Private/Language/locallang_core.xlf:labels.showPage'))
-                ->setIcon($this->iconFactory->getIcon('actions-view-page', Icon::SIZE_SMALL))
-                ->setHref('#');
-            $buttonBar->addButton($viewButton);
-            // Shortcut
-            $shortcutButton = $buttonBar->makeShortcutButton()
-                ->setModuleName($this->moduleName)
-                ->setGetVariables(['id', 'edit_record', 'pointer', 'new_unique_uid', 'search_field', 'search_levels', 'showLimit'])
-                ->setSetVariables(array_keys($this->MOD_MENU));
-            $buttonBar->addButton($shortcutButton);
-        }
-    }
-
-    /**
-     * Returns LanguageService
-     *
-     * @return \TYPO3\CMS\Core\Localization\LanguageService
-     */
-    protected function getLanguageService()
-    {
-        return $GLOBALS['LANG'];
-    }
-
-    /**
-     * Returns the current BE user.
-     *
-     * @return \TYPO3\CMS\Core\Authentication\BackendUserAuthentication
-     */
-    protected function getBackendUser()
-    {
-        return $GLOBALS['BE_USER'];
-    }
-
-    /**
-     * returns a new standalone view, shorthand function
-     *
-     * @param string $extensionName
-     * @param string $controllerExtensionName
-     * @param string $templateName
-     * @return StandaloneView
-     */
-    protected function getFluidTemplateObject($extensionName, $controllerExtensionName, $templateName = 'Main')
-    {
-        /** @var StandaloneView $view */
-        $view = GeneralUtility::makeInstance(StandaloneView::class);
-        $view->setLayoutRootPaths([GeneralUtility::getFileAbsFileName('EXT:' . $extensionName . '/Resources/Private/Layouts')]);
-        $view->setPartialRootPaths([GeneralUtility::getFileAbsFileName('EXT:' . $extensionName . '/Resources/Private/Partials')]);
-        $view->setTemplateRootPaths([GeneralUtility::getFileAbsFileName('EXT:' . $extensionName . '/Resources/Private/Templates')]);
-
-        $view->setTemplatePathAndFilename(GeneralUtility::getFileAbsFileName('EXT:' . $extensionName . '/Resources/Private/Templates/' . $templateName . '.html'));
-
-        $view->getRequest()->setControllerExtensionName($controllerExtensionName);
-        return $view;
-    }
-}
diff --git a/typo3/sysext/func/LICENSE.txt b/typo3/sysext/func/LICENSE.txt
deleted file mode 100644
index 95d36a78ffce9a9ad8c4000f87603a76dd17e67e..0000000000000000000000000000000000000000
--- a/typo3/sysext/func/LICENSE.txt
+++ /dev/null
@@ -1,345 +0,0 @@
-Some icons used in the TYPO3 project are retrieved from the "Silk" icon set of
-Mark James, which can be found at http://famfamfam.com/lab/icons/silk/. This
-set is distributed under a Creative Commons Attribution 2.5 License. The
-license can be found at http://creativecommons.org/licenses/by/2.5/.
----------------------------------
-
-                    GNU GENERAL PUBLIC LICENSE
-                       Version 2, June 1991
-
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-                            Preamble
-
-  The licenses for most software are designed to take away your
-freedom to share and change it.  By contrast, the GNU General Public
-License is intended to guarantee your freedom to share and change free
-software--to make sure the software is free for all its users.  This
-General Public License applies to most of the Free Software
-Foundation's software and to any other program whose authors commit to
-using it.  (Some other Free Software Foundation software is covered by
-the GNU Lesser General Public License instead.)  You can apply it to
-your programs, too.
-
-  When we speak of free software, we are referring to freedom, not
-price.  Our General Public Licenses are designed to make sure that you
-have the freedom to distribute copies of free software (and charge for
-this service if you wish), that you receive source code or can get it
-if you want it, that you can change the software or use pieces of it
-in new free programs; and that you know you can do these things.
-
-  To protect your rights, we need to make restrictions that forbid
-anyone to deny you these rights or to ask you to surrender the rights.
-These restrictions translate to certain responsibilities for you if you
-distribute copies of the software, or if you modify it.
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-(2) offer you this license which gives you legal permission to copy,
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-that everyone understands that there is no warranty for this free
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-                    GNU GENERAL PUBLIC LICENSE
-   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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-  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
-FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
-OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
-PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
-OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
-TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
-PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
-REPAIR OR CORRECTION.
-
-  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
-REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
-INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
-OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
-TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
-YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
-PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGES.
-
-                     END OF TERMS AND CONDITIONS
-
-            How to Apply These Terms to Your New Programs
-
-  If you develop a new program, and you want it to be of the greatest
-possible use to the public, the best way to achieve this is to make it
-free software which everyone can redistribute and change under these terms.
-
-  To do so, attach the following notices to the program.  It is safest
-to attach them to the start of each source file to most effectively
-convey the exclusion of warranty; and each file should have at least
-the "copyright" line and a pointer to where the full notice is found.
-
-    <one line to give the program's name and a brief idea of what it does.>
-    Copyright (C) <year>  <name of author>
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License along
-    with this program; if not, write to the Free Software Foundation, Inc.,
-    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
-
-Also add information on how to contact you by electronic and paper mail.
-
-If the program is interactive, make it output a short notice like this
-when it starts in an interactive mode:
-
-    Gnomovision version 69, Copyright (C) year name of author
-    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
-    This is free software, and you are welcome to redistribute it
-    under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate
-parts of the General Public License.  Of course, the commands you use may
-be called something other than `show w' and `show c'; they could even be
-mouse-clicks or menu items--whatever suits your program.
-
-You should also get your employer (if you work as a programmer) or your
-school, if any, to sign a "copyright disclaimer" for the program, if
-necessary.  Here is a sample; alter the names:
-
-  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
-  `Gnomovision' (which makes passes at compilers) written by James Hacker.
-
-  <signature of Ty Coon>, 1 April 1989
-  Ty Coon, President of Vice
-
-This General Public License does not permit incorporating your program into
-proprietary programs.  If your program is a subroutine library, you may
-consider it more useful to permit linking proprietary applications with the
-library.  If this is what you want to do, use the GNU Lesser General
-Public License instead of this License.
diff --git a/typo3/sysext/func/Resources/Private/Language/locallang_csh_web_func.xlf b/typo3/sysext/func/Resources/Private/Language/locallang_csh_web_func.xlf
deleted file mode 100644
index 7c9de15d11cf59f8986ada83d03823d371fefebe..0000000000000000000000000000000000000000
--- a/typo3/sysext/func/Resources/Private/Language/locallang_csh_web_func.xlf
+++ /dev/null
@@ -1,30 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<xliff version="1.0" xmlns:t3="http://typo3.org/schemas/xliff">
-	<file t3:id="1415814861" source-language="en" datatype="plaintext" original="messages" date="2011-10-17T20:22:33Z" product-name="lang">
-		<header/>
-		<body>
-			<trans-unit id=".alttitle">
-				<source>Web &gt; Functions module</source>
-			</trans-unit>
-			<trans-unit id=".description">
-				<source>The idea of the Web&gt;Functions module is to be a host module for backend applications that wish to perform processing of pages or branches of the page tree.</source>
-			</trans-unit>
-			<trans-unit id=".details">
-				<source>Conceptually the Web&gt;Functions module is different from the Web&gt;Info module only by offering processing  functionality rather than offering information only. It is up to extension programmers to decide in which of these two modules they want to insert functionality.</source>
-			</trans-unit>
-			<trans-unit id="_.seeAlso" xml:space="preserve">
-				<source>_MOD_web_info,
-More about the Web&gt;Functions module | https://docs.typo3.org/typo3cms/InsideTypo3Reference/CoreArchitecture/CoreModules/FunctionsModule/,,
-_MOD_web_func:tx_funcwizards</source>
-				<note from="developer">A part of this string is an internal text, which must not be changed. Just copy this part into the translation field and do not change it. For more information have a look at the Tutorial.</note>
-			</trans-unit>
-			<trans-unit id="_.image">
-				<source>EXT:func/Resources/Public/Images/Csh/pagetree_overview_11.png</source>
-				<note from="developer">This string contains an internal text, which must not be changed. Just copy the original text into the translation field. For more information have a look at the Tutorial.</note>
-			</trans-unit>
-			<trans-unit id=".image_descr">
-				<source>The Web&gt;Functions module as provided by the core is an empty shell. It provides an API that extensions can use to attach function menu items to the Web&gt;Function module. This shows the Wizard extension (func_wizards) providing the main Function Menu item in upper right corner. The "Select Wizard" selectorbox allows the user to select another level of functionality (different wizards) which are provided by other extensions.</source>
-			</trans-unit>
-		</body>
-	</file>
-</xliff>
diff --git a/typo3/sysext/func/Resources/Private/Language/locallang_mod_web_func.xlf b/typo3/sysext/func/Resources/Private/Language/locallang_mod_web_func.xlf
deleted file mode 100644
index 7708b09eed878ae8f8e242e87433a145502eeb09..0000000000000000000000000000000000000000
--- a/typo3/sysext/func/Resources/Private/Language/locallang_mod_web_func.xlf
+++ /dev/null
@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<xliff version="1.0" xmlns:t3="http://typo3.org/schemas/xliff">
-	<file t3:id="1415814879" source-language="en" datatype="plaintext" original="messages" date="2011-10-17T20:22:34Z" product-name="lang">
-		<header/>
-		<body>
-			<trans-unit id="title">
-				<source>Advanced functions</source>
-			</trans-unit>
-			<trans-unit id="clickAPage_content">
-				<source>Please click a page title in the page tree.</source>
-			</trans-unit>
-			<trans-unit id="mlang_labels_tablabel">
-				<source>Advanced functions</source>
-			</trans-unit>
-			<trans-unit id="mlang_labels_tabdescr">
-				<source>This module contains general export and import functions in addition to specialised wizards enabling page sorting and batch creating of pages.</source>
-			</trans-unit>
-			<trans-unit id="mlang_tabs_tab">
-				<source>Functions</source>
-			</trans-unit>
-		</body>
-	</file>
-</xliff>
diff --git a/typo3/sysext/func/Resources/Private/Templates/InfoBox.html b/typo3/sysext/func/Resources/Private/Templates/InfoBox.html
deleted file mode 100644
index 870c909462848c0834dc18d2e8a6a8a1ebd0e8db..0000000000000000000000000000000000000000
--- a/typo3/sysext/func/Resources/Private/Templates/InfoBox.html
+++ /dev/null
@@ -1,3 +0,0 @@
-<f:be.infobox title="{title}" state="{state}">
-	<f:format.raw>{message}</f:format.raw>
-</f:be.infobox>
diff --git a/typo3/sysext/func/Resources/Private/Templates/Main.html b/typo3/sysext/func/Resources/Private/Templates/Main.html
deleted file mode 100644
index 000f554811d4970ec5b1cf6dd599219a77131b54..0000000000000000000000000000000000000000
--- a/typo3/sysext/func/Resources/Private/Templates/Main.html
+++ /dev/null
@@ -1,4 +0,0 @@
-<form action="{moduleName}" method="post" id="PageFunctionsController">
-    <input type="hidden" name="id" value="{id}" />
-    <f:format.raw>{functionMenuModuleContent}</f:format.raw>
-</form>
diff --git a/typo3/sysext/func/Resources/Public/Icons/Extension.png b/typo3/sysext/func/Resources/Public/Icons/Extension.png
deleted file mode 100644
index 0e2966d2a83cdd52f511011c3b795b854aa647db..0000000000000000000000000000000000000000
Binary files a/typo3/sysext/func/Resources/Public/Icons/Extension.png and /dev/null differ
diff --git a/typo3/sysext/func/Resources/Public/Icons/module-func.svg b/typo3/sysext/func/Resources/Public/Icons/module-func.svg
deleted file mode 100644
index 2c893fd831d4d5d50485c675cda0e08a836c955e..0000000000000000000000000000000000000000
--- a/typo3/sysext/func/Resources/Public/Icons/module-func.svg
+++ /dev/null
@@ -1 +0,0 @@
-<svg viewBox="0 0 64 64" xmlns="http://www.w3.org/2000/svg"><title>module-func</title><g fill="none" fill-rule="evenodd"><path d="M0 0h64v64H0z" fill="#08596C"/><path d="M38.083 22H48v4H34v-2h-4v2H16v-4h10.002v-3.01c0-.546.45-.99 1.007-.99h10.067c.556 0 1.007.451 1.007.99V22zM30 28H16v14h32V28H34v4h-4v-4zm-2-8v2h8v-2h-8z" fill="#FFF"/></g></svg>
\ No newline at end of file
diff --git a/typo3/sysext/func/Resources/Public/Images/Csh/pagetree_overview_11.png b/typo3/sysext/func/Resources/Public/Images/Csh/pagetree_overview_11.png
deleted file mode 100644
index 6209158287b9848304e11caef5421ca8f3d8812c..0000000000000000000000000000000000000000
Binary files a/typo3/sysext/func/Resources/Public/Images/Csh/pagetree_overview_11.png and /dev/null differ
diff --git a/typo3/sysext/func/composer.json b/typo3/sysext/func/composer.json
deleted file mode 100644
index ec500c15657055e9c6eabce46d0a2e49f1939a30..0000000000000000000000000000000000000000
--- a/typo3/sysext/func/composer.json
+++ /dev/null
@@ -1,26 +0,0 @@
-{
-	"name": "typo3/cms-func",
-	"type": "typo3-cms-framework",
-	"description": "TYPO3 Core",
-	"homepage": "https://typo3.org",
-	"license": ["GPL-2.0+"],
-
-	"require": {
-		"typo3/cms-core": "*"
-	},
-	"replace": {
-		"func": "*"
-	},
-	"extra": {
-		"typo3/cms": {
-			"Package": {
-				"partOfFactoryDefault": true
-			}
-		}
-	},
-	"autoload": {
-		"psr-4": {
-			"TYPO3\\CMS\\Func\\": "Classes/"
-		}
-	}
-}
diff --git a/typo3/sysext/func/ext_emconf.php b/typo3/sysext/func/ext_emconf.php
deleted file mode 100644
index 58898b8de355d45ea79b0adbd12025cb7be89a6f..0000000000000000000000000000000000000000
--- a/typo3/sysext/func/ext_emconf.php
+++ /dev/null
@@ -1,21 +0,0 @@
-<?php
-$EM_CONF[$_EXTKEY] = [
-    'title' => 'Web>Func',
-    'description' => 'Advanced functions',
-    'category' => 'module',
-    'state' => 'stable',
-    'uploadfolder' => 0,
-    'createDirs' => '',
-    'clearCacheOnLoad' => 0,
-    'author' => 'Kasper Skaarhoj',
-    'author_email' => 'kasperYYYY@typo3.com',
-    'author_company' => '',
-    'version' => '9.0.0',
-    'constraints' => [
-        'depends' => [
-            'typo3' => '9.0.0-9.0.99',
-        ],
-        'conflicts' => [],
-        'suggests' => [],
-    ],
-];
diff --git a/typo3/sysext/func/ext_tables.php b/typo3/sysext/func/ext_tables.php
deleted file mode 100644
index 0ef04f09136a7e773011c24b62627d02b938ebbd..0000000000000000000000000000000000000000
--- a/typo3/sysext/func/ext_tables.php
+++ /dev/null
@@ -1,22 +0,0 @@
-<?php
-defined('TYPO3_MODE') or die();
-
-if (TYPO3_MODE === 'BE') {
-    \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addModule(
-        'web',
-        'func',
-        '',
-        '',
-        [
-            'routeTarget' => \TYPO3\CMS\Func\Controller\PageFunctionsController::class . '::mainAction',
-            'access' => 'user,group',
-            'name' => 'web_func',
-            'icon' => 'EXT:func/Resources/Public/Icons/module-func.svg',
-            'labels' => 'LLL:EXT:func/Resources/Private/Language/locallang_mod_web_func.xlf'
-        ]
-    );
-    \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addLLrefForTCAdescr(
-        '_MOD_web_func',
-        'EXT:func/Resources/Private/Language/locallang_csh_web_func.xlf'
-    );
-}
diff --git a/typo3/sysext/install/Classes/Updates/FuncExtractionUpdate.php b/typo3/sysext/install/Classes/Updates/FuncExtractionUpdate.php
new file mode 100644
index 0000000000000000000000000000000000000000..679fca51257126e7b4a46ff5cc808256ea9e4b96
--- /dev/null
+++ b/typo3/sysext/install/Classes/Updates/FuncExtractionUpdate.php
@@ -0,0 +1,124 @@
+<?php
+namespace TYPO3\CMS\Install\Updates;
+
+/*
+ * This file is part of the TYPO3 CMS project.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+/**
+ * Installs and downloads EXT:func
+ */
+class FuncExtractionUpdate extends AbstractDownloadExtensionUpdate
+{
+    /**
+     * @var string
+     */
+    protected $title = 'Install extension "func" from TER';
+
+    /**
+     * @var string
+     */
+    protected $extensionKey = 'func';
+
+    /**
+     * @var array
+     */
+    protected $extensionDetails = [
+        'func' => [
+            'title' => 'Web->Functions module',
+            'description' => 'Provides Web->Functions BE module used in previous TYPO3 versions for extensions that still rely on it.',
+            'versionString' => '9.0.1',
+        ]
+    ];
+
+    /**
+     * Checks if an update is needed
+     *
+     * @param string $description The description for the update
+     * @return bool Whether an update is needed (true) or not (false)
+     */
+    public function checkForUpdate(&$description)
+    {
+        $description = 'The extension "func" that brings the "Web->Functions" backend module has been extracted to'
+            . ' the TYPO3 Extension Repository. This update downloads the TYPO3 extension func from the TER.'
+            . ' Use this if you\'re dealing with extensions in the instance that rely on "Web->Functions" and bring own'
+            . ' modules.';
+
+        $updateNeeded = false;
+
+        if (!$this->isWizardDone()) {
+            $updateNeeded = true;
+        }
+
+        return $updateNeeded;
+    }
+
+    /**
+     * Second step: Ask user to install the extension
+     *
+     * @param string $inputPrefix input prefix, all names of form fields have to start with this. Append custom name in [ ... ]
+     * @return string HTML output
+     */
+    public function getUserInput($inputPrefix)
+    {
+        return '
+            <div class="panel panel-danger">
+                <div class="panel-heading">Are you really sure?</div>
+                <div class="panel-body">
+                    <p>You should install EXT:func only if you really need it.</p>
+                    <p>This update wizard cannot check if the extension was installed before the update.</p>
+                    <p>Are you really sure, you want to install EXT:func?</p>
+                    <div class="btn-group clearfix" data-toggle="buttons">
+                        <label class="btn btn-default active">
+                            <input type="radio" name="' . $inputPrefix . '[install]" value="0" checked="checked" /> no, don\'t install
+                        </label>
+                        <label class="btn btn-default">
+                            <input type="radio" name="' . $inputPrefix . '[install]" value="1" /> yes, please install
+                        </label>
+                    </div>
+                </div>
+            </div>
+        ';
+    }
+
+    /**
+     * Performs the update if EXT:func should be installed.
+     *
+     * @param array $databaseQueries Queries done in this update
+     * @param string $customMessage Custom message
+     * @return bool
+     */
+    public function performUpdate(array &$databaseQueries, &$customMessage)
+    {
+        $requestParams = GeneralUtility::_GP('install');
+        if (!isset($requestParams['values']['funcExtension']['install'])) {
+            return false;
+        }
+        $install = (int)$requestParams['values']['funcExtension']['install'];
+
+        if ($install === 1) {
+            // user decided to install extension, install and mark wizard as done
+            $updateSuccessful = $this->installExtension($this->extensionKey, $customMessage);
+            if ($updateSuccessful) {
+                $this->markWizardAsDone();
+                return true;
+            }
+        } else {
+            // user decided to not install extension, mark wizard as done
+            $this->markWizardAsDone();
+            return true;
+        }
+        return $updateSuccessful;
+    }
+}
diff --git a/typo3/sysext/install/ext_localconf.php b/typo3/sysext/install/ext_localconf.php
index 850cab8e24e48cb67a4bde4cbd1da006275427f5..1d19b05e0e674da18211a8a2a23f63080fceb5da 100644
--- a/typo3/sysext/install/ext_localconf.php
+++ b/typo3/sysext/install/ext_localconf.php
@@ -55,3 +55,5 @@ $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/install']['update']['rtehtmlareaE
 // Add update wizards below this line
 $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/install']['update']['typo3DbLegacyExtension']
     = \TYPO3\CMS\Install\Updates\Typo3DbExtractionUpdate::class;
+$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/install']['update']['funcExtension']
+    = \TYPO3\CMS\Install\Updates\FuncExtractionUpdate::class;