Web Development

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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 (134)
3,397 weekly downloads

Wappalyzer No Restart

Wappalyzer is a browser extension that identifies software on websites.

Rated 4 out of 5 stars (80)
3,391 weekly downloads

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 (82)
3,134 weekly downloads

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 (444)
3,108 weekly downloads

Html Validator

HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon

For Firefox 23+, you need 0.958 (under review)
http://users.skynet.be/mgueury/mozilla

Rated 5 out of 5 stars (183)
3,073 weekly downloads

FoxyProxy Basic

FoxyProxy Basic is a simple on/off proxy switcher. More advanced features and configuration options are offered by FoxyProxy Standard.

Rated 4 out of 5 stars (23)
3,049 weekly downloads

Pearl Crescent Page Saver Basic screenshot tool

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 (66)
2,975 weekly downloads

Quick Locale Switcher

Allows you to quickly switch to a different language (User Interface, Spell Checker Dictionary and Website content) in your Mozilla application.

Rated 4 out of 5 stars (69)
2,879 weekly downloads

ShowIP

Show the IP address(es) of the current page in the status bar. It also allows querying custom information services by IP (right click) and hostname (left click), like whois, netcraft, etc. Additionally you can copy the IP address to the clipboard.

Rated 3 out of 5 stars (213)
2,824 weekly downloads

eCleaner Featured

Clears preferences left by extensions after uninstallation

Rated 4 out of 5 stars (58)
2,750 weekly downloads

Selenium Expert (Selenium IDE)

This plugin is my attempt to bring the wonderful world of inspections, tips, hints, fixes and refactoring to Selenese! The Selenium Expert goes through your selenium test cases suggesting improvements, giving tips and even lets you apply them.

Rated 5 out of 5 stars (1)
2,736 weekly downloads

CacheViewer

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

Rated 4 out of 5 stars (195)
2,707 weekly downloads

Easy Copy Featured

Copy a page's details such as its title, URL and HTML source with one click so you can paste it anywhere else such as emails, blogs and forums. Copy a single page, all open tabs or all links on a page. Format text as plain text or HTML.

Rated 5 out of 5 stars (16)
2,697 weekly downloads

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 (22)
2,550 weekly downloads

Tiny JavaScript Debugger

TinyJSD is a JavaScript debugger for privileged code running Mozilla products like Firefox, Thunderbird, SeaMonkey. It serves to debug the application as well as extensions written in JavsScript.

Rated 4 out of 5 stars (3)
2,533 weekly downloads

FireMobileSimulator

this add-on simulates japanese mobile device.
this add-on support DoCoMo, Au(KDDI) and SoftBank device.

Rated 4 out of 5 stars (11)
2,522 weekly downloads

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 (29)
2,503 weekly downloads

FireQuery

Firebug plugin for jQuery development

Rated 4 out of 5 stars (43)
2,464 weekly downloads

Favorites (Selenium IDE)

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 (3)
2,449 weekly downloads

about:addons-memory No Restart

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

Rated 5 out of 5 stars (59)
2,427 weekly downloads