Web and Developer Tools

Subscribe

Web Developer

The Web Developer extension adds various web developer tools to the browser.

Rated 5 out of 5 stars (237)
442,593 users
Updated July 27, 2016

NoScript Security Suite Featured

The best security you can get in a web browser!
Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.

Rated 5 out of 5 stars (1,587)
2,020,475 users
Updated July 26, 2016

Remote XUL Manager No Restart

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 (36)
64,400 users
Updated July 23, 2016

Click-to-Play Manager No Restart

Manages the Click-to-Play domain whitelist.

Rated 4 out of 5 stars (11)
3,009 users
Updated July 23, 2016

Flagfox No Restart

Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...

Rated 5 out of 5 stars (656)
471,793 users
Updated July 21, 2016

Live HTTP Headers (clone) No Restart

View HTTP headers of a page and while browsing.

This is an unofficial "Live HTTP headers" clone, mainly to fix the Replay feature!

Rated 5 out of 5 stars (3)
2,311 users
Updated July 16, 2016

Screengrab (fix version)

Screengrab! saves webpages as images.
0.99 released!
New features: upload to internet

Rated 5 out of 5 stars (316)
128,227 users
Updated July 16, 2016

Browser View Plus

Open links, pages, and bookmarks in any other browser or media player. Modify any menu, browser name or location. Incognito/private browsing mode is also supported. Works for all Firefox locales/languages.

Rated 5 out of 5 stars (20)
1,048 users
Updated July 11, 2016

Element Inspector No Restart

In the DOM Inspector,quickly navigate to the any elements

Rated 5 out of 5 stars (28)
3,329 users
Updated July 2, 2016

Classic Toolbar Buttons No Restart

'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 (150)
37,018 users
Updated July 1, 2016

RequestPolicy Continued No Restart

Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.

Rated 4 out of 5 stars (5)
7,498 users
Updated June 26, 2016

Open With Photoshop No Restart

Open With Photoshop is a new companion for web and graphic designers to open up any web image with Adobe Photoshop via a single and quick mouse click.

Rated 5 out of 5 stars (82)
16,835 users
Updated June 24, 2016

Open With

Quickly test out your web pages in Internet Explorer, Chrome, Safari, or Opera. Open With opens the current page in your other browsers with just one click. Add Open With to your menus, toolbars and developer toolbox today!

Rated 4 out of 5 stars (180)
20,453 users
Updated June 18, 2016

Add-ons Manager - Version Number No Restart

Restores version numbers for all installed add-ons inside Add-on Manager on Firefox, Thunderbird and Seamonkey.

Rated 5 out of 5 stars (18)
1,576 users
Updated June 17, 2016

Font Finder

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 (71)
33,496 users
Updated June 5, 2016

Full Web Page Screenshots (♥♥♥♥♥)

FireShot makes full web page screenshots. Demo: http://bit.ly/RlBQMV

Screenshots can be quickly captured and:

― Saved as Image or PDF
― Sent to clipboard
― Printed
― Annotated *
― Uploaded *
― E-Mailed *

* OS Windows only

Rated 5 out of 5 stars (454)
266,927 users
Updated June 3, 2016

Element Hiding Helper for Adblock Plus No Restart

Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.

Rated 5 out of 5 stars (449)
577,379 users
Updated May 3, 2016

Modify HTTP Response No Restart

Rewrite http response body using search & replace patterns

Rated 5 out of 5 stars (1)
592 users
Updated May 2, 2016

about:addons-memory 2016 No Restart

Adds a new page that shows add-on memory usage

Rated 5 out of 5 stars (19)
6,765 users
Updated May 1, 2016

Web Server Check Tool

A tool to perform basic checks on web and DAV servers.

Not yet rated
99 users
Updated April 18, 2016