diff --git a/ext/mass_tagger/main.php b/ext/mass_tagger/main.php
deleted file mode 100644
index fe91b366..00000000
--- a/ext/mass_tagger/main.php
+++ /dev/null
@@ -1,74 +0,0 @@
-<?php
-/*
- * Name: Mass Tagger
- * Author: Christian Walde <walde.christian@googlemail.com>, contributions by Shish and Agasa
- * License: WTFPL
- * Description: Tag a bunch of images at once
- * Documentation:
- *  Once enabled, a new "Mass Tagger" box will appear on the left hand side of
- *  post listings, with a button to enable the mass tagger. Once clicked JS will
- *  add buttons to each image to mark them for tagging, and a field for
- *  inputting tags will appear. Once the "Tag" button is clicked, the tags in
- *  the text field will be added to marked images.
- */
-
-class MassTagger extends Extension
-{
-    public function onPostListBuilding(PostListBuildingEvent $event)
-    {
-        global $config, $page, $user;
-        
-        if ($user->is_admin()) {
-            $this->theme->display_mass_tagger($page, $event, $config);
-        }
-    }
-
-    public function onPageRequest(PageRequestEvent $event)
-    {
-        global $page, $user;
-        if ($event->page_matches("mass_tagger/tag") && $user->is_admin()) {
-            if (!isset($_POST['ids']) or !isset($_POST['tag'])) {
-                return;
-            }
-
-            $tags = Tag::explode($_POST['tag']);
-
-            $pos_tag_array = [];
-            $neg_tag_array = [];
-            foreach ($tags as $new_tag) {
-                if (strpos($new_tag, '-') === 0) {
-                    $neg_tag_array[] = substr($new_tag, 1);
-                } else {
-                    $pos_tag_array[] = $new_tag;
-                }
-            }
-
-            $ids = explode(':', $_POST['ids']);
-            $ids = array_filter($ids, 'is_numeric');
-
-            $images = array_map("Image::by_id", $ids);
-
-            if (isset($_POST['setadd']) && $_POST['setadd'] == 'set') {
-                foreach ($images as $image) {
-                    $image->set_tags($tags);
-                }
-            } else {
-                foreach ($images as $image) {
-                    if (!empty($neg_tag_array)) {
-                        $img_tags = array_merge($pos_tag_array, $image->get_tag_array());
-                        $img_tags = array_diff($img_tags, $neg_tag_array);
-                        $image->set_tags($img_tags);
-                    } else {
-                        $image->set_tags(array_merge($tags, $image->get_tag_array()));
-                    }
-                }
-            }
-
-            $page->set_mode(PageMode::REDIRECT);
-            if (!isset($_SERVER['HTTP_REFERER'])) {
-                $_SERVER['HTTP_REFERER'] = make_link();
-            }
-            $page->set_redirect($_SERVER['HTTP_REFERER']);
-        }
-    }
-}
diff --git a/ext/mass_tagger/script.js b/ext/mass_tagger/script.js
deleted file mode 100644
index 0e4dbcd9..00000000
--- a/ext/mass_tagger/script.js
+++ /dev/null
@@ -1,41 +0,0 @@
-/*jshint bitwise:true, curly:true, forin:false, noarg:true, noempty:true, nonew:true, undef:true, strict:false, browser:true, jquery:true */
-
-function activate_mass_tagger ( image_link ) {
-    $(".shm-thumb").each(
-        function ( index, block ) {
-            add_mass_tag_button( $(block), image_link );
-        }
-    );
-    $('#mass_tagger_controls').show();
-    $('#mass_tagger_activate').hide();
-}
-
-function add_mass_tag_button($block, image_link) {
-	
-    var c = function() { toggle_tag(this, $block.data("post-id")); return false; };
-
-    $block.find("A").click(c);
-    $block.click(c); // sometimes the thumbs *is* the A
-}
-
-function toggle_tag( button, id ) {
-    id += ":";
-    var list = $('#mass_tagger_ids');
-    var string = list.val();
-    
-    if( (string.indexOf(id) == 0) || (string.indexOf(":"+id) > -1) ) {
-		$(button).removeClass('mass-tagger-selected');
-		string = string.replace(id, '');
-		list.val(string);
-	}
-	else {
-		$(button).addClass('mass-tagger-selected');
-		string += id;
-		list.val(string);
-	}
-}
-
-$(function () {
-	// Clear the selection, in case it was autocompleted by the browser.
-	$('#mass_tagger_ids').val("");
-});
diff --git a/ext/mass_tagger/style.css b/ext/mass_tagger/style.css
deleted file mode 100644
index c0a2ea6c..00000000
--- a/ext/mass_tagger/style.css
+++ /dev/null
@@ -1,3 +0,0 @@
-.mass-tagger-selected {
-	border: 3px solid blue;
-}
\ No newline at end of file
diff --git a/ext/mass_tagger/theme.php b/ext/mass_tagger/theme.php
deleted file mode 100644
index f5894cbb..00000000
--- a/ext/mass_tagger/theme.php
+++ /dev/null
@@ -1,25 +0,0 @@
-<?php
-
-class MassTaggerTheme extends Themelet
-{
-    public function display_mass_tagger(Page $page, Event $event, $config)
-    {
-        $data_href = get_base_href();
-        $body = "
-			<form action='".make_link("mass_tagger/tag")."' method='POST'>
-				<input id='mass_tagger_activate' type='button' onclick='activate_mass_tagger(\"$data_href\");' value='Activate'/>
-				<div id='mass_tagger_controls' style='display: none;'>
-					Click on images to mark them. Use the 'Index Options' in the Board Config to increase the amount of shown images.
-					<br />
-					<input type='hidden' name='ids' id='mass_tagger_ids' />
-					Set instead of add? <input type='checkbox' name='setadd' value='set' />
-					<label>Tags: <input type='text' name='tag' class='autocomplete_tags' autocomplete='off' /></label>
-
-					<input type='submit' value='Tag Marked Images' />
-				</div>
-			</form>
-		";
-        $block = new Block("Mass Tagger", $body, "left", 50);
-        $page->add_block($block);
-    }
-}
diff --git a/ext/mass_tagger/toggle.gif b/ext/mass_tagger/toggle.gif
deleted file mode 100644
index 64c3c765..00000000
Binary files a/ext/mass_tagger/toggle.gif and /dev/null differ