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URL Fixer Plus RU and UA

Extended URL Fixer for RU and UA

Rated 4 out of 5 stars (20)
58,194 users

FirePHP

FirePHP enables you to log to your Firebug Console using a simple PHP method call.

Not using Firebug 1.9+ on Firefox 8+? See http://firephp.org/

Rated 4 out of 5 stars (45)
58,106 users

JavaScript Deobfuscator No Restart

This add-on shows you what JavaScript code runs on a web page, even if it is obfuscated and generated on the fly. Simply open JavaScript Deobfuscator from the Web Developer menu and watch the scripts being compiled/executed.

Rated 4 out of 5 stars (21)
56,669 users

Poster

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 (61)
56,025 users

HTTP/2 and SPDY indicator No Restart

An indicator showing HTTP/2 and SPDY support in the address bar.

Rated 4 out of 5 stars (18)
53,651 users

HttpRequester

A tool for easily making HTTP requests (GET/PUT/POST/DELETE), viewing the responses, and keeping a history of transactions.

Rated 4 out of 5 stars (39)
52,771 users

Extended Statusbar No Restart

A Statusbar with speed, percentage, time and loaded size (similar to Opera's one)

Rated 4 out of 5 stars (249)
52,677 users

Lightshot (screenshot tool) No Restart

Easy and convenient screenshot tool. Allows you to make screenshots of any selected area (video and flash too), edit and upload it to server.

Rated 5 out of 5 stars (170)
52,429 users

Abduction! - Webpage Screenshots Screen Capture

1) Capture an page or just a specific region.
2) Adds a right click option to take screen shots of an entire web page or just part of a web page to save as an image.

VIDEO: http://youtu.be/vpnPvNShpWQ

Rated 4 out of 5 stars (516)
52,163 users

CacheViewer

This extenion is GUI Front-end of "about:cache"...

Rated 4 out of 5 stars (218)
51,502 users

JS Print Setup

Client side Javascript printer settings.
This extension implements print setup from CS Javascript, similar of MeadCo's ScriptX ActiveX control for Internet Explorer.

Rated 5 out of 5 stars (21)
44,771 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 5 out of 5 stars (180)
44,666 users

Classic Toolbar Buttons No Restart Featured

'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 (141)
41,035 users

SEO Toolbar by Moz

Access important SEO metrics while you surf the web. This toolbar from Moz lets you see metrics like Domain Authority and Page Authority for every page you visit, analyze links as you browse, expose page elements, and access other SEO tools.

Rated 4 out of 5 stars (36)
40,357 users

Advanced Cookie Manager Featured

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 (28)
40,092 users

Auto Refresh

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 (35)
39,877 users

Rainbow Color Tools Featured

Color tools for web development.

Color picker and eyedropper + saving colors and trying out colors with drag and drop.

Rated 5 out of 5 stars (93)
38,814 users

about:addons-memory No Restart

Adds an about:addons-memory page that details add-on memory usage

Rated 4 out of 5 stars (85)
38,425 users

CodeBurner for Firebug

CodeBurner is a Firefox add-on that integrates with Firebug, to extend it with reference material for HTML and CSS.

Rated 3 out of 5 stars (33)
38,214 users

Search by Image for Google No Restart

Google Search by Image:

Use rightclick on an image to quickly find out the source of an image, how it is used, or find higher resolution versions via Google Reverse Image search.
(Google Image Search is similar to Tineye Reverse image search).

Rated 4 out of 5 stars (113)
36,990 users