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about:telemetry No Restart

Display telemetry data in about:telemetry. See http://mzl.la/WI0hZz for descriptions. See http://arewesnappyyet.com for aggregated data.

*** NOTE ***: Firefox 19+ has a built-in about:telemetry page

Rated 4 out of 5 stars (8)
444 users

Advanced Dork:

Advanced Dork: gives quick access to Google's Advanced Operators directly from the context menu...

Rated 5 out of 5 stars (19)
325 users

Android Debug Bridge For Firefox No Restart

This addon adds some Android Debug Bridge access to Firefox. It requires access to the adb/adb.exe executable from the Android SDK.

Rated 5 out of 5 stars (2)
393 users

AuctionSearchKit

One-click eBay tools providing useful information to the buyer including a map of where items are located, past feedback on similar items and seller history/statistics.

Not yet rated
44 users

BBCode

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

Rated 4 out of 5 stars (60)
1,712 users

bbeContainer

an extension that allows users to edit local files with browser-based editors.

Not yet rated
28 users

Browser View

Open Firefox links, pages, and bookmarks in any other browsers.

Rated 4 out of 5 stars (33)
1,844 users

Classic Toolbar Buttons No Restart

'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions on Windows.

Beta builds on versions page!

Rated 5 out of 5 stars (78)
28,638 users

Click-to-Play Manager No Restart

Manages the Click-to-Play domain whitelist.

Rated 5 out of 5 stars (7)
3,552 users

Config Descriptions No Restart

Shows source comments for advanced application preferences in about:config

Rated 5 out of 5 stars (16)
2,643 users

Console Chrome Filter

Adds a chrome:// filter button to the Console in SeaMonkey

Not yet rated
2 users

Console²

Console² (pronounced Console Squared or Console Two) replaces the JavaScript Console with what could be the next generation Error Console. From v0.5 includes the Console Filter extension previously available separately from the Console² website.

Rated 5 out of 5 stars (45)
16,914 users

Controle de Scripts

Controle de Scripts is an extension that allows you to control what JavaScripts do on your browser.

Rated 4 out of 5 stars (27)
3,784 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 (8)
3,114 users

Cookie Importer

Imports cookies from a textfile.
Reads Netscape standard cookies.txt files as exported by IE and others.
Very useful in combination with the Cookie Exporter add-on.

Rated 5 out of 5 stars (2)
7,115 users

Copy Pure Text

Allows to copy selected text as plain text by adding a 'Copy as Text' menu item to context menu.

Rated 4 out of 5 stars (15)
4,095 users

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 (61)
20,844 users

Debugger Server Enabler No Restart

Starts the remote debugger server.

Not yet rated
13 users

docked JS-Console

docks the JS-Console to the Bottom of the Browser

feel free to have a look at the source (see below) and suggest enhancements (borstel33 web de , Subject: docked JS-Console)

Rated 4 out of 5 stars (10)
366 users

DOM Inspector

DOM Inspector is a tool that can be used to inspect and edit the live DOM of any web document or XUL application. The DOM can be navigated using a two-paned window displaying a variety of different views on the document and all nodes within.

Rated 5 out of 5 stars (53)
143,385 users