Collection:IceCat WebExtensions (proposed)

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Do not work on this page or on the extension pages, any work will be overwritten by a bot.

This page superseded FSD:IceCat extensions (proposed) because Firefox 57 (so IceCat 57) will ONLY run WebExtensions Firefox 57.

IceCat is based on Firefox ESR. Firefox ESR version 57 will be released between 2018-03-06 and 2018-06-26 according to Mozillas RapidRelease/calendar. It will take some weeks extra for IceCat to build.


+1 M Daily Users

uBlock Origin
Finally, an efficient blocker. Easy on CPU and memory. Review note: uBlock Origin is ideally used with Violentmonkey and user script Anti-Adblock Killer Continued (AAK-Cont). "uBlock Origin ("uBO") and uMatrix must be considered incompatible with NoScript." - Raymond Hill, author of uBlock Origin. You can subscribe to GNU IceCat SpyBlock filters “Block all well known privacy trackers: (high risk of web page breakage)” and “Block all third party resources when in private browsing: (high risk of web page breakage in private browsing mode)” through SpyBlock uses filters merged from EasyList, and EasyList is already enabled by default in uBO. However, duplicated filters will be discarded so you can subscribe to anything you want without being concerned about CPU usage. uBlock Origin is an excellent tool to block popunders, currently the only of its kind.

100-999 k Daily Users

With EPUBReader you can read ePub files just in Firefox. No additional software needed!

10-99 k Daily Users

Ageless for YouTube
Watch age restricted YouTube videos without signing in.

10-99 k Daily Users

Bloody Vikings!
Simplifies the use of temporary e-mail addresses in order to protect your real address from spam. Supports inter alia and

Download Youtube Video
Save video from any Youtube video in High definition HD or Standard definition SD.

Forecastfox (fix version)
Get international weather forecasts from and display them in any toolbar or statusbar with this highly customizable and unobtrusive extension. Review note: The original software Forecastfox Weather is unlicensed.

Google search link fix This extension prevents Google, Yahoo and Yandex search pages from modifying search result links when you click them. This is useful when copying links but it also helps privacy by preventing the search engines from recording your clicks.

Privacy Badger
Protects your privacy by blocking spying ads and invisible trackers. Review note: Prevents canvas based fingerprinting, (like CanvasBlocker) supercookies (like Click&Clean), and unique cookies that contain tracking IDs.

Snap Links Plus Select a number of links with a rectangle and open them all in new tabs in the same or a new window(s), download them or copy them to the clipboard. You can also lasso checkboxes to quickly check or uncheck them.

Turn Off the Lights
The entire page will be fading to dark, so you can watch the video as if you were in the cinema. Review note: Especially useful for video sites with unblocked ads that can be hidden with “Turn Off the Lights Settings - Basics - Automatically dim the background when you click the play button and vice versa”

Wappalyzer is a browser extension that identifies software on websites.

0-9 k Daily Users

Smart HTTPS (revived)
Automatically changes HTTP addresses to the secure HTTPS, and if loading encounters error, reverts it back to HTTP.

User-Agent Switcher (revived)
Quickly and easily switch between popular user-agent strings.

Violentmonkey provides userscripts support for browsers. Review note: Useful to block anti-blockers with developed user scripts. User Scripts are licensed separately by their authors so you should check them separately in order to verify if they are free software.

Zoom Page WE
Zoom web pages either per-site or per-tab, with optional fit-to-width and minimum text size, using the toolbar button, context menu, keyboard shortcuts or mouse wheel. Review note: You have to configure it to make it useful, for example on 20” computer monitors people usually prefer: Preferences -> Zoom levels -> Default Level (%): 150
This extension can be used as a workaround to Firefox bug: Set a Default Text Size (or Page Zoom Level) in Tools > Options > Content > Default Page Size - 

License issues

100-999 k Daily Users

AdBlocker for YouTube

AdBlocker Ultimate

Awesome Screenshot Plus
Capture the whole page or any portion, annotate it with rectangles, circles, arrows, lines and text, blur sensitive info, one-click upload to share. And more!

Bulk Media Downloader
Grab and download media (image, audio, and video) resources by monitoring network (like FlashGot or Flash video downloader extensions)
License issue: 

Easy Youtube Video Downloader Express
Only one with 1080p Full-HD and 192kbps MP3 Direct Links. A clean, fast and simple addon for superfast and easy downloads in FLV,3GP,MP3,MP4,720p, 1080p qualities on Youtube pages.
License issue: Sent to * The “Support E-mail” ( listed on is dead. Can you please remove it? * If you remove it, can you then add this text:

“Support desk is closed due to overwhelming response which I am unable to handle alone. PRO users can use the email-id from their Paypal receipt to get urgent support.” (quoted from * Can you please download and save it as file name "LICENSE" in your add-on?

Emoji Keyboard

New Tab Override (WebExtension)

Reddit Enhancement Suite
A suite of tools to enhance Reddit

10-99 k Daily Users

Dark YouTube Theme

Dictionary (Google™ Translate) Anywhere

Emoji Cheatsheet

Font Finder (revived)

Instant Translate: Ultimate Translator


QR Code Image Generator

Reader is the ultimate Reader tool for Firefox. Review note: View -> Page Style -> No Style default in IceCat.

TinEye Reverse Image Search

To Google Translate
Right-click on a section of text and click on Translate icon next to it to translate or listen it to your language.
License issue: 

Video Downloader Prime

Wayback Machine
Detects dead pages, 404s, DNS failures & a range of other web breakdowns, offering to show archived versions via the Internet Archive's Wayback Machine. In addition you can archive web pages, and see their most recent & first archives.
License issue: 

YouTube™ Flash-HTML5

0-9 k Daily Users

Bookmarks Manager and Viewer
An elegant bookmarks manager with fuzzy search and more
This extension can be used as a workaround to Firefox bug: Add "Open Enclosing Folder" context menu to search results of bookmarks in the Library window (link to view/open containing folder, parent folder button) -
License issue: 

Cookie AutoDelete Control your cookies! This WebExtension is inspired by Self Destructing Cookies. When a tab closes, any cookies not being used are automatically deleted. Whitelist the ones you trust while deleting the rest. Support for Container Tabs (Firefox 53+).
License issue: 

Country Flags & IP Whois

Download all Images

Dynamically removes browsing history based on keywords and/or domains. Never use 'Private Browsing' again!
License issue: 

Flash Block (Plus)
Provides control over Flash contents
License issue: 




Mute all inactive tabs
Automatically mutes all inactive tabs.
License issue: 

NemID Nøglefilsprogram
NemID Nøglefilsprogram er nødvendigt for at bruge NemID nøglefil eller NemID på hardware.
License issue: 

Org Capture
A helper for capturing things via org-protocol in emacs: First, set up: or
License issue: 

Popup Blocker (strict) Strictly block all popup requests from any website by default. A notification window is opened to allow you accept, reject, open the popup in background page, or redirect the current page to popup address
License issue: 

Porn site Blocker
A basic porn site blocker addons for firefox browser.t blocks the detected site automatically.You can help us to prevent the porn site. Please send us a review, create a issue and give the site name which site is not listed.
License issue: 

Print Edit WE
Print Edit WE provides facilities to edit the contents of a web page prior to printing or saving. Elements in the web page can be edited, formatted, hidden or deleted. Unwanted content, such as adverts and sidebars, can easily be removed.

Reverse Image Search

Search image

Simple Form Fill
Enter text into input fields by choosing items from the context menu or using the optional autocomplete.
License issue: 

Sky Timer
Sky timer. London Big Ben, Pockemon or sample sounds! Don't miss your time.
License issue: 

Speed Dial (Lite)

Tab notifier

Tab Reloader (Page Reloader)

Tile Tabs WE
Take tabs from a parent window and arrange them in a layout of tiled sub-windows, using the toolbar button, context menu or keyboard shortcuts. Makes it easy to browse, compare or monitor multiple pages. Synchronize scroll. Save and re-open layouts.

Tomato Clock

WebRTC Control
Have control over WebRTC (disable or enable) and protect your IP address.
License issue: 

Wikipedia Peek

Yet Another Smooth Scrolling WE
Replaces scrolling with the mouse wheel and the arrow keys into totally customizable smooth one. Review note: To make it useful you have to enter its Preferences and increase Step Size, and Acceleration Sensitivity to productive scroll levels.
License issue: 

Youtube Dark Mode

YouTube in HD (720p, 1080p, 1440p, 2160p)
Watch YouTube in the full-HD quality or the highest available one
License issue: 

YouTube Stop AutoPlay Next Stop YouTube from Playing next tracks (aka disable autoplay button).
License issue: 

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.