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The best security you can get in a web browser!
Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.
Ghostery Compatible with Firefox 57+ Featured
Increase your browsing privacy, protection, and speed.
Automate Firefox. Record and replay repetitive tasks. If you're tired of manually visiting the same sites, filling out forms, downloading files and extracting data, then iMacros is for you! Save time, effort and money with iMacros browser automation!
Web Developer Requires Restart
The Web Developer extension adds various web developer tools to the browser.
QuickJava Requires Restart
Firebug Autocompleter Requires Restart
Firebug command line autocomplete.
JS Print Setup Requires Restart
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.
FireSSH Requires Restart
Scriptish Requires Restart
The greatest user script engine on the Internet (a fork of Greasemonkey).
PrefBar Requires Restart
DejaClick Requires Restart
Record, bookmark and replay your browser activities in a snap with DéjàClick. Designed for Firefox, DéjàClick can handle the most complex websites - including AJAX, Flash, forms and more. With a single click you can repeat your most common tasks.
use UserScripts on your Firefox for Android with usi!