by narcelio

30 Add-ons in this Collection

Adblock Plus by Wladimir Palant

Rated 5 out of 5 stars 4,972 reviews

21,876,015 users

Blocks annoying video ads on YouTube, Facebook ads, banners and much more.

Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,790 reviews

2,437,512 users

Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page...

DownThemAll! by Nils Maier, Federico Parodi, others

Rated 5 out of 5 stars 1,610 reviews

1,414,406 users

The first and only download manager/accelerator built inside Firefox!

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 957 reviews

1,304,539 users

Customize the way a web page displays or behaves, by using small bits of JavaScript.

Web Developer by chrispederick

Rated 5 out of 5 stars 217 reviews

602,191 users

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

Tab Mix Plus by onemen, Gary Reyes

Rated 4 out of 5 stars 2,544 reviews

955,120 users

Tab Mix Plus enhances Firefox's tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focus, tab clicking options, undo closed tabs and windows, plus much more. It also includes a full-featured session manager.

JavaScript Debugger by James Ross, Robert Ginda, others

Rated 4 out of 5 stars 50 reviews

143,063 users

As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.

Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.

Session Manager by Michael Kraft

Rated 4 out of 5 stars 567 reviews

292,545 users

Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.

Live HTTP Headers by Daniel Savard, Nikolas Co

Rated 4 out of 5 stars 157 reviews

182,273 users

View HTTP headers of a page and while browsing.

Tree Style Tab by Piro (piro_or)

Download Now


Rated 4 out of 5 stars 1,220 reviews

105,914 users

Show tabs like a tree.

JSONView by Ben Hollis

Rated 5 out of 5 stars 133 reviews

108,636 users

View JSON documents in the browser.

Poster by Alex Milowski

Rated 4 out of 5 stars 61 reviews

53,683 users

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...

Brazilian Portuguese Dictionary (New Spelling) by jhultmann

Rated 4 out of 5 stars 23 reviews

54,778 users

The same spellchecker shipped with the Brazilian version of Firefox.

Exif Viewer by Alan Raskin

Rated 4 out of 5 stars 83 reviews

71,312 users

Displays the Exif and IPTC data in local and remote JPEG images.

View Cookies by Edwin Martin

Rated 4 out of 5 stars 43 reviews

30,691 users

It adds a tab to the Page Info dialog box, which shows the cookies belonging to the current page.
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