Web and Developer Tools
InspectorWidget Requires Restart
Adds toolbar button and context menus for invoking the DOM Inspector (DOMi) for either chrome or content elements.
Cookie Exporter Requires Restart
Exports all cookies in IE manner.
Makes a Netscape standard cookies.txt file.
Very useful for WGET --load-cookies option.
EmotiConverter Requires Restart
Post your best emoticons of the easiest and fastest way.
BBCode Requires Restart
Adds BBCode, HTML, XHTML & Symbols formatting to the context menu for forums.
Live HTTP Headers Requires Restart
View HTTP headers of a page and while browsing.
Linkification Requires Restart
Converts text links into genuine, clickable links...
MR Tech Disable XPI Install Delay Requires Restart
Disables default delay when installing...
RequestPolicy Requires Restart
Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.
Stylish Requires Restart
Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Tumblr, and many, many other sites. You can even customize Firefox and other programs themselves.
This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.
HttpFox Requires Restart
An HTTP analyzer addon for Firefox
Open With Requires Restart
Quickly test out your web pages in Internet Explorer, Chrome, Safari, or Opera. Open With opens the current page in your other browsers with just one click. Add Open With to your menus, toolbars and developer toolbox today!
SQLite Manager Requires Restart
Manage any SQLite database on your computer.
FoxyProxy Standard Requires Restart
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.
Firesizer Requires Restart
Allows you to resize the window to specific dimensions.
NOTE: Users of Firefox 29 and above must install "The Addon Bar" extension to use this, as Firesizer uses the add-on bar that has been removed in Firefox 29.
Stylish-Custom Requires Restart
custom additions to Stylish extension
MR Tech Toolkit Requires Restart
(Formerly Local Install) The primary goal of this extension is to provide the tools needed to install and manage extensions and themes locally and tons of other features.
Note: With Toolkit 6.0 Auto Archiving is fully working in Firefox 2.0 and temp...
Pretty-prints JSON content in the browser for easy, unobtrusive viewing.
Shows source comments for advanced application preferences in about:config