Set any custom image as favicon to a JavaScript bookmarklet in Mozilla Firefox with Bookmark Favicon Changer add-on. It’s a free extension, and works will all flavours of Firefox.
Mozilla Firefox
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This tutorial explains how to flip the DNT switch ON in the five most popular browsers: Mozilla Firefox, Internet Explorer, Opera, Apple Safari, and Google Chrome.
Create as many Firefox profiles as you want using the Profile Manager and easily launch them using dedicated profile desktop shortcuts.
Markdown Here is an extension that lets you write email in Markdown and render it before sending with syntax highlighting. It’s available for Google Chrome, Mozilla Firefox, and Thunderbird.
Two new exiting tools have just landed in Firefox 15: Responsive Mode and Layout View. These new tools will help web developers test their responsive websites in different screen sizes right within the browser.
Scriptify is a light weight extension for Firefox that provides a hassle-free way to convert any user script to a standalone add-on for Firefox.
Hide or remove the new real time feed ticker in Facebook from your homepage and sidebar on Chrome and Firefox, and disable the floating top bar on Chrome.
Facebook Fixed Header is a userscript that keeps the Facebook navigation menu ‘fixed’ to the top of the screen, while the content scrolls under it.
Gmail Preview Pane Extend userscript removes the right-sidebar in Gmail and extends Preview Pane to the full width of the screen. It works on Chrome and Firefox.
Facebook Sidebar Chat Reversion is a userscript that brings back the old Facebook chat layout and functionality. It works on Google Chrome, Mozilla Firefox and Opera.