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Font Finder (revived) Compatible with Firefox 57+ Featured

Get all CSS styles of selected text

Rated 5 out of 5 stars (14)
2,455 weekly downloads

Charles Proxy Auto-Configuration Requires Restart

Configures Mozilla Firefox for use with Charles Web Debugging Proxy.

Rated 4 out of 5 stars (7)
2,408 weekly downloads

YSlow Requires Restart

YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.
http://yslow.org is the official open source website.

Rated 3 out of 5 stars (221)
2,346 weekly downloads

Font Finder Requires Restart Featured

FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.

Rated 4 out of 5 stars (75)
2,339 weekly downloads

Edit Cookies Requires Restart

This extension is now being partly maintained by Abine http://www.abine.com/.
New version of Edit Cookies by us is here: http://abine.com/edit_cookies.php
Send us any feedback about what you want:support@getabine.com.

Rated 4 out of 5 stars (49)
2,272 weekly downloads

The Addon Bar (Restored)

Gives you a place to put all your add-on buttons without over-crowding the navigation bar.

Rated 5 out of 5 stars (322)
2,146 weekly downloads

Autofill Forms Requires Restart

Autofill Forms enables you to fill out web forms with one click.

Rated 3 out of 5 stars (392)
2,128 weekly downloads

Advanced Cookie Manager Requires Restart

A must have tool for Web Developers and Testers to Manage and monitor web cookies.

Features List:
Add
Delete
Modify
Export / Backup
Import / Restore
Monitor cookies

Available in English, French, Spanish, German and Italian languages.

Rated 4 out of 5 stars (37)
2,097 weekly downloads

Emoji Cheatsheet Featured

A reference for the codes to generate Emojis on popular sites like GitHub or Basecamp and Unicode characters for Twitter and Facebook.
Search Emojis by name or view recently selected items. Emojis are automatically copied to the clipboard.

Rated 4 out of 5 stars (44)
1,977 weekly downloads

Poster Requires Restart

A developer tool for interacting with web services and other web resources that lets you make HTTP requests, set the entity body, and content type. This allows you to interact with web services and inspect the results...

Rated 4 out of 5 stars (62)
1,947 weekly downloads

signTextJS plus

window.crypto.signText replacement plus enhancements

Rated 4 out of 5 stars (15)
1,945 weekly downloads

NoRedirect Requires Restart

NoRedirect lets the user take control of HTTP redirects. It can be used to interdict an ISP's DNS search redirection hijacks, preview/screen "shortened" URLs (e.g., TinyURL), stop the annoying redirection of "smart" error pages, etc.

Rated 4 out of 5 stars (51)
1,889 weekly downloads

ipFood Requires Restart Featured

Simulate the use of a series of proxy changing at each new connection.

Rated 4 out of 5 stars (8)
1,881 weekly downloads

Favorites (Selenium IDE) Requires Restart

A plugin for Selenium-IDE to have favorite test suites and open and execute the test suites with a single click

Rated 4 out of 5 stars (4)
1,870 weekly downloads

QR Code Image Generator Featured

Create a QR Code of the selected text or current URL. Use CTRL-SHIFT-Q to quickly see the QR Code. Also possible to create a QR Code from free text within Firefox. Works completely offline! Now with UTF8 support.

Rated 4 out of 5 stars (32)
1,852 weekly downloads

User-Agent Switcher (revived) Compatible with Firefox 57+

Quickly and easily switch between popular user-agent strings.

Rated 4 out of 5 stars (9)
1,827 weekly downloads

Pearl Crescent Page Saver screenshot tool Requires Restart

Save an image of a web page (including Flash content) to a file. Web page screenshots may be captured interactively or from the command line. Options allow you to control the output format (PNG or JPEG), image file name, scaling, and much more.

Rated 4 out of 5 stars (93)
1,812 weekly downloads

Auto Refresh Requires Restart

Auto Refresh will refresh or hard refresh any tab or group of tabs at individual or group intervals.

You can also customize your presets and save the ones you most use.

http://www.grizzlyape.com/addons/auto-refresh/

Rated 3 out of 5 stars (48)
1,776 weekly downloads

Empty Cache Button Requires Restart

Cache clearing made easy. One click.

Rated 4 out of 5 stars (87)
1,771 weekly downloads

FlareGet Integration

FlareGet Browser Integration extension

Rated 4 out of 5 stars (5)
1,723 weekly downloads