Most Popular Extensions
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.
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.)
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...
Tetris is a tile-matching puzzle game.
Translate selected text on current web pages.
No need to leave current web pages.
Translate results come from Bing Translate.
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The ultimate Productivity & ToDo list add-on,designed to personalize your browser experience while search the web from your NewTab
Painlessly merge a series of web pages into one.
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.
Foxy SEO Tool offers tools for search engine optimization (SEO), web traffic and page analysis for webmasters and web professionals.
Stop YouTube from Playing next tracks (aka disable autoplay button).
Request websites over secure https by default from the location bar instead of insecure http.
Force YouTube to use Flash player over the HTML5 player
Make Donald Drumpf Again! Replaces all instances of "Trump" with "Drumpf".
ClassLink provides secure and simple single sign-on access to all your apps, files and classes from anywhere.
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
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.
Cloud Viewer Featured
Open various types of files in Google Docs Viewer