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Ghostery No Restart Featured

Protect your privacy. See who's tracking your web browsing and block them with Ghostery.

Rated 5 out of 5 stars (1,107)
1,452,361 users

Transparent standalone images No Restart

This add-on renders standalone images on a transparent background, so you can see the image in all its glory!

Rated 5 out of 5 stars (36)
1,501 users

app.telemetry Page Speed Monitor No Restart

Get the page load times of any web page! app.telemetry Page Speed Monitor shows offset and duration of each step during the page load based on W3C navigation timing.

Rated 5 out of 5 stars (9)
7,059 users

Read Easily

Fast page style switcher. It adds toolbar button, context menu item and hotkey (CTRL+ALT+Z) to disable/enable styles on web pages.

Rated 5 out of 5 stars (20)
1,252 users

Tab Data (+Memory usage) No Restart

Provides user with tab related stats and memory usage

Rated 5 out of 5 stars (19)
6,496 users

Toggle JS No Restart

A simple toolbar button to quickly toggle javascript between enabled or disabled.
A green shield is shown when javascript is enabled and a red shield is shown when it is disabled

Rated 5 out of 5 stars (8)
5,080 users

pwgen - Password Generator

For Sysadmins / Network Engineers / and why not everybody who needs a quick password generator.. simple, yet efficient.

Rated 5 out of 5 stars (43)
5,742 users

ColorZilla

Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...

Rated 5 out of 5 stars (300)
280,893 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 (60)
147,934 users

MitM Me (Cert Error Bypass)

For IT admins who want very much to click through thousands of self-signed certificate warnings and get MitM attacked, this simplifies the process.

Development was discontinued, for details please read "About"

Rated 5 out of 5 stars (13)
751 users

HideScrollbars No Restart

"Hide Scrollbars" add-on removes scrollbars for those who prefer mouse wheel and keyboard navigation.

Rated 5 out of 5 stars (10)
1,507 users

HeadingsMap

The extension generates a documentmap or index of any web document structured with headings and/or with sections in HTML 5. It shows the headings structure, the errors in the structure (ie. incorrect levels), and it works as HTML5 Outliner too.

Rated 5 out of 5 stars (15)
3,394 users

HackTheWeb

The Web. Displayed Your Way.
Click to zap away rubbish.
Hack out the noise, read, print in peace.
* Widen Elements & Text.
* Save the changes to Stylish.
* Remove Sidebars & Ads.
* Black on White.
* Isolate.
User empowerment (bsd on aardvark)

Rated 5 out of 5 stars (34)
7,453 users

Aardvark

Cool utility for cleaning up a page (for printing or better viewing) as well as for web development. Displays a red rectangle on the element under the mouse -- hit "w" to go wider (get the containing element), then hit other keystrokes to remove, etc

Rated 5 out of 5 stars (155)
2,189 users

HackBar

Simple security audit / Penetration test tool.

Rated 5 out of 5 stars (39)
34,362 users

Clear Cache

Clear Cache was developed to make it easier for Web development, clearing your browser cache (RAM and DISK) by pressing a button or via the F9 key.

F9 Fever! ;)

Rated 5 out of 5 stars (22)
17,540 users

XPath Checker

An interactive editor for XPath expressions.

Rated 5 out of 5 stars (18)
28,019 users

Document Map

Displays the current page's heading structure in the sidebar, allowing rapid navigation between...

Rated 5 out of 5 stars (16)
61 users

Copy Fixer

Copy the page title and URL using Ctrl-C or Command-C.

Rated 5 out of 5 stars (10)
1,147 users

Extensor No Restart

Toolbar panel with quick access to common actions for all add-ons: activate/deactivate, options, details, home/review/donation pages, uninstall, restart. For Firefox 35 and newer.

Rated 5 out of 5 stars (8)
408 users