Most Popular Extensions


Extension Auto-Installer

Extension Auto-Installer is a helper for Firefox/SeaMonkey/Thunderbird extension developers: it allows automatically adding or updating browser extensions, e.g. via command line tools. This makes testing your changes easier.

Rated 5 out of 5 stars (16)
3,331 users

Dorando keyconfig Requires Restart

A modified Dorando's tool to rebind keys in Mozilla apps. It is designed to be a drop-in replacement, and will keep your old settings. (See details for upgrade instructions.)

As of version 2016.2, Custom keys (using custom JavaScript) works again!

Rated 5 out of 5 stars (22)
3,330 users

Word Count Tool

A word counter that counts the number of words, characters without any extra clicks. Just select the text and right click to select the context menu to invoke the report. It gives detail report about the numbers words, characters, sentences...

Rated 4 out of 5 stars (37)
3,300 users

Tetris Game

Tetris is a tile-matching puzzle game.

Rated 1 out of 5 stars (1)
3,274 users


Translate selected text on current web pages.
No need to leave current web pages.
Translate results come from Bing Translate.
Thanks for your support!

Rated 3 out of 5 stars (9)
3,202 users

BSW. Der BonusMelder

Nie wieder BSW-Vorteile verpassen!
BSW. Der BonusMelder zeigt Ihnen beim Surfen automatisch, bei welchen Shops Sie BSW-Vorteile erhalten.
Beim Klick auf die aktive Lasche werden die verfügbaren Vorteile für die aktuelle Webseite angezeigt.

Rated 4 out of 5 stars (6)
3,182 users

The Next Task NewTab

The ultimate Productivity & ToDo list add-on,designed to personalize your browser experience while search the web from your NewTab

Rated 5 out of 5 stars (1)
3,176 users


Painlessly merge a series of web pages into one.

Rated 4 out of 5 stars (63)
3,158 users


Improving the Steam User Experience by giving the user information that can help make purchase decisions. We display stats about each game on steam on the store page! Super Steam is based on Enhanced Steam by jshackles. This add-on is 100% free.

Rated 5 out of 5 stars (10)
3,148 users

Foxy SEO Tool

Foxy SEO Tool offers tools for search engine optimization (SEO), web traffic and page analysis for webmasters and web professionals.

Rated 5 out of 5 stars (19)
3,128 users

YouTube Stop AutoPlay Next

Stop YouTube from Playing next tracks (aka disable autoplay button).

Rated 4 out of 5 stars (9)
3,073 users

HTTPS by default

Request websites over secure https by default from the location bar instead of insecure http.

Rated 5 out of 5 stars (7)
2,983 users

YouTube use Flash Player

Force YouTube to use Flash player over the HTML5 player

Rated 4 out of 5 stars (3)
2,975 users

Nepi Jano!

Read paid content on for free

Rated 5 out of 5 stars (9)
2,972 users


Make Donald Drumpf Again! Replaces all instances of "Trump" with "Drumpf".

Rated 4 out of 5 stars (30)
2,958 users

ClassLink OneClick Extension

ClassLink provides secure and simple single sign-on access to all your apps, files and classes from anywhere.

Not yet rated
2,950 users

Keywords Everywhere

Install this keyword tool add-on to view useful keyword search volume and cost per click data on multiple websites like Google Search Console, Google Analytics, UberSuggest, Majestic Anchor Text pages and Moz Open Site Explorer

Rated 4 out of 5 stars (12)
2,940 users


Highlighter with different colors, saving options, customizable highlight styles and undo/redo functionality.
Select some text, press M - done.
Changes can be stored in Textmarker history for later visits.

Rated 5 out of 5 stars (24)
2,875 users

Cloud Viewer Featured

Open various types of files in Google Docs Viewer

Rated 4 out of 5 stars (44)
2,817 users

Click-to-Play Manager

Manages the Click-to-Play domain whitelist.

Rated 4 out of 5 stars (11)
2,754 users