Web Development

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DOM Inspector Requires Restart

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 (75)
75,173 users

JS Print Setup Requires Restart

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 (32)
67,228 users

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 (83)
66,994 users

Wappalyzer Compatible with Firefox 57+

Wappalyzer is a browser extension that identifies software on websites.

Rated 4 out of 5 stars (110)
66,629 users

User-Agent Switcher

Quickly and easily switch between popular user-agent strings.

Rated 4 out of 5 stars (42)
56,524 users

HttpFox Requires Restart

An HTTP analyzer addon for Firefox

Rated 4 out of 5 stars (173)
56,306 users

RefControl Requires Restart

Control what gets sent as the HTTP Referer on a per-site basis.

Rated 4 out of 5 stars (172)
55,142 users

Disable WebRTC Compatible with Firefox 57+

WebRTC leaks your actual IP addresses from behind your VPN, by default.

Rated 4 out of 5 stars (94)
53,134 users

McAfee Security Scan Plus detection

This extension allows Adobe installers to detect McAfee Security Scan Plus software is installed on your PC.

Rated 1 out of 5 stars (15)
52,423 users

CacheViewer Requires Restart

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

Rated 4 out of 5 stars (221)
49,589 users

IE View Requires Restart

Lets you load pages in IE with a single right-click, or mark certain sites to *always* load in IE.

Rated 3 out of 5 stars (152)
49,070 users

Empty Cache Button Compatible with Firefox 57+

Cache clearing made easy. One click.

Rated 4 out of 5 stars (112)
48,904 users

User Agent Overrider

Override browser user agent string

Rated 4 out of 5 stars (64)
45,890 users

signTextJS plus

window.crypto.signText replacement plus enhancements

Rated 4 out of 5 stars (24)
44,293 users

Emoji Cheatsheet Compatible with Firefox 57+ 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 (47)
42,953 users

Autofill Forms Requires Restart

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

Rated 3 out of 5 stars (401)
41,927 users

IE Tab + (FF 8+, 7, 6, 5, 4, 3.6, 3.5, SeaMonkey) Requires Restart

IE Tab + is an enhanced version of IE Tab. It supports FF 3.5 or greater, integrates IE Tab with Adblock Plus in the IE Tab engine, and synchronizes cookies between IE and Firefox. You can easily import settings from the original IE Tab into IE Tab +

Rated 3 out of 5 stars (83)
40,446 users

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 (210)
39,828 users

Fire IE (FireIE, Enhanced IE) Requires Restart

Embeds Internet Explorer(IE) to use the powerful Firefox add-ons.
Not only an enhanced IE Tab, but also an enhanced Internet Explorer with Adblock Plus and FireGestures support.
Switch to the IE engine in one click and dismiss your IE.

Rated 4 out of 5 stars (198)
38,590 users

Extended Statusbar

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

Rated 4 out of 5 stars (249)
38,380 users