Collection:IceCat WebExtensions (proposed)

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

IceCat is based on Firefox ESR. Firefox ESR version 60.0 (Firefox ESR version 57 was never released) was released 8th May 2018. I have no idea if the delay will be extra long since it's the first Firefox Quantum-based (Firefox 57+) IceCat version. Please be patient.


1-Click YouTube Video Download
The simplest YouTube Video Downloader for all YouTube Flash sites, period.

Adblock Plus
Blocks annoying video ads on YouTube, Facebook ads, banners and much more. Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

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

Belgium eID
Use the Belgian electronic identity card (eID) in Firefox

BlockSite is an extension, which automagically blocks websites of your choice. Additionally, this extension will disable all hyperlinks to these websites, by just displaying the link text without the clicking functionality.

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

Blocks the JS-API for modifying <canvas> to prevent Canvas-Fingerprinting.</canvas>

Protects you against tracking through "free", centralized, content delivery. It prevents a lot of requests from reaching networks like Google Hosted Libraries, and serves local files to keep sites from breaking. Complements regular content blockers.

Direct Currency Converter
Autoconverts prices from any currency to prices in a selectable currency while browsing. Supports $, £, ¥, ؋, ৳, ฿, ៛, ₡, ₦, ₨, ₩, ₪, ₫, €, ₭, ₮, ₱, ₲, ₴, ₵, ₸, ₹, ₺, ₼, ₽, ﷼, etc.

Disable WebRTC
WebRTC exposes your internal network IP(s), without user interaction.

Download Flash and Video
Download Flash and Video is a great download helper tool that lets you download Flash games and Flash videos (YouTube, Facebook, Dailymotion, Google Videos and more) with a single click. The downloader is very easy to use.

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

Easy Screenshot
Easy Screenshot is an easy to use screen capture tool. Simply press one of the context menu items to capture entire or a portion of your screen.

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

Forecastfox (fix version)
Get international weather forecasts from and display them in any toolbar or statusbar with this highly customizable and unobtrusive extension.

Form History Control
Manage form history entries (search, edit, cleanup, export/import) and easy text formfiller. Auto-save text entered in any form while typing to allow fast recovery when disaster strikes. Control for which webpage form history is saved or not.

Lets you replace text in web pages. You can define a substitution list and apply it automatically or at your own discretion, or make individual substitutions. You can use this as a filter, or just for fun :)

FoxyProxy Standard
FoxyProxy is an advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. For a simpler tool and less advanced configuration options, please use FoxyProxy Basic.

GNU LibreJS aims to address the JavaScript problem described in Richard Stallman's article The JavaScript Trap. It is a free add-on for Mozilla browsers. It blocks nonfree nontrivial JavaScript while allowing JavaScript that is free and/or trivial.

Customize the way a web page displays or behaves, by using small bits of JavaScript.

Makes YouTube stream H.264 videos instead of VP8/VP9 videos. Try h264ify if YouTube videos stutter, take up too much CPU, eat battery life, or make your laptop hot.

HTML5 Video Everywhere!
Replace video player with Firefox native video player.

HTTPS Everywhere
Encrypt the web! HTTPS Everywhere is a Firefox extension to protect your communications by enabling HTTPS encryption automatically on sites that are known to support it, even when you type URLs or follow links that omit the https: prefix.

Link Gopher

Location Guard

MM3 Proxy Switch
In the Firefox Browser (and other Mozilla programs) you can per default configure only the setting for one internet connection. With this Proxy Switch you can manage different configurations and simply switch over between these.

NoScript Security Suite
Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.

Painlessly merge a series of web pages into one.

Pearltrees lets you organize all your interests.

Popup Blocker Prevents your web browser from opening a new window on top of the content or web site you are viewing. The Addon also supresses unwanted advertisement windows on your screen. The one deciding what consitutes a popup is the user.

Privacy Badger
Protects your privacy by blocking spying ads and invisible trackers.

Privacy Settings
Alter Firefox's built-in privacy settings easily with a toolbar panel.

Download from SVT Play and other services. Requires FFmpeg.

Ratings Preview for YouTube

Improves PACER, the electronic public access system for the U.S. Federal District and Bankruptcy Courts.

Notice: some important features (XML indentation and load old saved requests) are missing in version 2.0.0, please update to version 2.0.1.

S3.Google Translator
S3.Google Translator adds the power of Google Translate’s automatic translations to your browser!

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

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.

Strict Pop-up Blocker
Quickly toggle between blocking all pop-up windows and allowing some pop-ups

Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Orkut, and many, many other sites. You can even customize Firefox and other programs themselves.

Tab Auto Refresh
Automatically refresh tabs based on custom time intervals

Text Link Allows URI texts written in webpages to be loaded by double clicks.

Theme Font & Size Changer
Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.

Tree Style Tab
Show tabs like a tree.

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.

uBlock Origin
Finally, an efficient blocker. Easy on CPU and memory.

Point & click to forbid/allow any class of requests made by your browser. Use it to block scripts, iframes, ads, facebook, etc.

Update Scanner
Monitors web pages for updates. Useful for websites that don't provide Atom or RSS feeds.

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

Violentmonkey provides userscripts support for browsers.

Wappalyzer is a browser extension that identifies software on websites.

Web Developer
The Web Developer extension adds various web developer tools to the browser.

YouTube Control Center
Simply search the artist or song of your choice and enjoy.

YouTube Video and Audio Downloader (WebEx)
Download YouTube videos in all available formats and extract the original audio files

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.

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.