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Dafizilla Table2Clipboard

Mozilla applications allow to select rows and columns from a table simply pressing Control key and picking rows/columns with left mouse button.
The selection can be copied to clipboard but the original table disposition is lost making ugly results wh...

Rated 5 out of 5 stars (63)
19,922 users

Cookie Exporter

Exports all cookies in IE manner.
Makes a Netscape standard cookies.txt file.
Very useful for WGET --load-cookies option.

Rated 5 out of 5 stars (13)
4,691 users

Restartless Restart No Restart

This 15KB restartless add-on will add a "File" -> "Restart" menu item and a ctrl/cmd + alt + r hotkey to restart Firefox or Seamonkey.

Rated 4 out of 5 stars (211)
30,665 users

BBCode

Adds BBCode, HTML, XHTML & Symbols formatting to the context menu for forums.

Rated 4 out of 5 stars (69)
963 users

EmotiConverter

Post your best emoticons of the easiest and fastest way.

Rated 5 out of 5 stars (33)
479 users

Config Descriptions No Restart

Shows source comments for advanced application preferences in about:config

Rated 5 out of 5 stars (20)
2,331 users

SQLite Manager

Manage any SQLite database on your computer.

Rated 5 out of 5 stars (46)
213,853 users

Live HTTP Headers

View HTTP headers of a page and while browsing.

Rated 4 out of 5 stars (168)
166,191 users

Linkification

Converts text links into genuine, clickable links...

Rated 4 out of 5 stars (310)
26,602 users

MR Tech Disable XPI Install Delay

Disables default delay when installing...

Rated 5 out of 5 stars (16)
249 users

InspectorWidget

Adds toolbar button and context menus for invoking the DOM Inspector (DOMi) for either chrome or content elements.

Rated 5 out of 5 stars (7)
1,347 users

HttpFox

An HTTP analyzer addon for Firefox

Rated 4 out of 5 stars (166)
96,735 users

RequestPolicy

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.

Rated 4 out of 5 stars (229)
102,607 users

Re-Pagination No Restart

See more search results etc. on one page, concatenating several pages together...

Rated 4 out of 5 stars (51)
5,148 users

Open With

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!

Rated 4 out of 5 stars (176)
21,905 users

No More Install Delay No Restart

UPDATE: XPI delay has been removed in Firefox 40!

Disable the install delay in Firefox. New 2.0 version now includes GreaseMonkey scripts!

Unlike similar addons, this works on Firefox 4 and beyond.

Rated 4 out of 5 stars (13)
842 users

Stylish

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.

Rated 4 out of 5 stars (811)
507,785 users

FoxyProxy Standard

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.

Rated 4 out of 5 stars (355)
301,201 users

MR Tech Toolkit

(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...

Rated 4 out of 5 stars (143)
39,359 users

Firesizer

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.

Rated 4 out of 5 stars (129)
29,742 users