Web Development

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Stacked Inspector Requires Restart

Switch DOM Inspector to an over/under vertical layout instead of the usual side-by-side panel layout.

Rated 5 out of 5 stars (10)
310 users

Tabbed View Source

View Page Source in New Tab, Current Tab or New Window

Rated 5 out of 5 stars (10)
250 users

StylRRR - Barebones Userstyle Injector

Lets you add userstyles ( website and browser themes) with a mini addon.

Rated 5 out of 5 stars (23)
674 users

Remote XUL Manager

Manages the Remote XUL whitelist to allow websites and local files to load XUL content. For versions compatible with Firefox 41 and lower, see All Versions page below.

Rated 5 out of 5 stars (37)
32,610 users

Free OmniGraffle (.graffle) Viewer

Open your OmniGraffle files for free

Rated 5 out of 5 stars (9)
201 users

Nuke Anything Enhanced Requires Restart

Allows you to hide almost anything via context menu 'Remove Object'.

Rated 5 out of 5 stars (133)
17,801 users

Refresh Blocker

Blocking all Meta Auto-Refresh reloading according to user-preference

Rated 5 out of 5 stars (9)
2,198 users

Who is Hosting this Website? Compatible with Firefox 57+

Who is Hosting This Website is a free Add-on service for telling you- where websites are being hosted. "Who is Hosting this Website?" will also determine and display the IP address, DNS records and domain name ownership information (Whois Records).

Rated 5 out of 5 stars (9)
296 users

IP Geolocator Compatible with Firefox 57+

Shows detailed information about your IP and location.

Rated 5 out of 5 stars (9)
509 users

LinkSidebar Requires Restart

View, search and test hyperlinks in a web page.

Perform group actions on multiple links like opening in tabs, copying link locations or testing to determine response times. Allows you to search/sort links and highlight their position on the webpage.

Rated 5 out of 5 stars (16)
1,367 users

StyleSheet Chooser Plus Requires Restart

StyleSheet Chooser Plus (aka SSCP) persists choice of website stylesheets.

Rated 5 out of 5 stars (17)
47 users

Fusebox 5 Reload Requires Restart

This extension (for Firefox 1.5 - 3.0) adds a menu item to the context menu (right-click) and the Tools menu to rebuild the Fusebox 5 memory structure and reparse the XML files. It includes the new (in Fusebox 5) options to loadclean and parseall. Yo...

Rated 5 out of 5 stars (17)
44 users

Transparent standalone images

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 (40)
1,096 users

CoLT Requires Restart

CoLT (short for "Copy Link Text") makes it easy to copy either a link's text, or both the link text and its URL in a format you specify. This non-invasive extension simply appears as context menu items when you right-click a link. Fully customizable!

Rated 5 out of 5 stars (102)
4,546 users

Full Screen for Firefox Compatible with Firefox 57+

Go full screen with one click on the button.

Rated 5 out of 5 stars (11)
994 users

Element Properties Requires Restart

Returns the 'Properties' menu item that was removed in Firefox 3.6 to the context menu.

Rated 5 out of 5 stars (118)
2,922 users

WebSocket Monitor

WebSocket monitor is an extension for Firefox developer tools that can be used to monitor WebSocket connections in Firefox. It allows to inspect all data sent and received.

Rated 5 out of 5 stars (11)
4,223 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 (30)
43,014 users

View formatted source (format source extension) Requires Restart

Displays formatted and color-coded source and optional CSS information for each element. ...

Rated 5 out of 5 stars (22)
117 users

All About Location Bar Requires Restart

Make URL modification an accurate, smooth and simple experience

Rated 5 out of 5 stars (20)
248 users