development

by Stephan Kleiber

58 Add-ons in this Collection

Adblock Plus by Wladimir Palant, Eyeo

Rated 5 out of 5 stars 6,273 reviews

13,854,336 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).

Stylish - Custom themes for any website by userstyles.org

Rated 4 out of 5 stars 1,118 reviews

346,102 users

Stylish lets you customize any website with custom user styles (themes for websites). Choose from the largest userstyles library to change the color scheme, background, and skin for Google, Facebook, YouTube and many, many more sites.

FoxyProxy Standard by Eric H. Jung

Rated 4 out of 5 stars 505 reviews

174,379 users

FoxyProxy is an advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. For a simpler tool and less advanced configuration options, please use FoxyProxy Basic.

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 4 out of 5 stars 2,375 reviews

1,099,930 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 4 out of 5 stars 2,173 reviews

895,080 users

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

Web Developer by chrispederick

Rated 4 out of 5 stars 361 reviews

273,660 users

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

ColorfulTabs by Shivanand Sharma

Rated 4 out of 5 stars 1,148 reviews

135,593 users

The first addon you should be installing on a fresh Firefox install. A must have. The most beautiful yet the simplest add-on that makes a strong colorful appeal. Colors every tab in a different color.

Full Web Page Screenshots (♥♥♥♥♥) by susbox

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

Screenshots can be quickly captured and:

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

* OS Windows only

Tab Mix Plus by onemen, Gary Reyes

Rated 4 out of 5 stars 2,751 reviews

552,522 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.

Xmarks Sync by Xmarks Inc.

Rated 3 out of 5 stars 2,874 reviews

127,640 users

Xmarks is the #1 bookmarking and open tab add-on. Keep your bookmarks, and open tabs backed up and synchronized across computers and browsers. Mobile phones with Premium access. Utilize LastPass to sync passwords!

Password Exporter by Justin Scott (fligtar), Jorge Villalobos

Rated 4 out of 5 stars 440 reviews

169,417 users

This add-on allows you to export your saved passwords and disabled login hosts using XML or CSV files that can be imported later.

Note: This add-on won't work in Firefox 57. It may eventually if the APIs to access passwords are implemented.

Html Validator by Marc Gueury

Rated 4 out of 5 stars 210 reviews

28,755 users

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

For Firefox 56, use 0.974 (see all versions below).
For Firefox 57, see Web Extensions.

IE Tab by PCMan, yuoo2k

Rated 4 out of 5 stars 1,232 reviews

101,318 users

IE Tab - an extension from Taiwan, features: Embedding Internet Explorer in tabs of Mozilla/Firefox...

FEBE by Chuck_Baker

Rated 4 out of 5 stars 645 reviews

62,024 users

FEBE (Firefox Environment Backup Extension) allows you to quickly and easily backup your Firefox extensions. In fact, it goes beyond just backing up -- It will actually rebuild your extensions individually into installable .xpi files.

Flashblock by Philip Chee

Rated 4 out of 5 stars 1,148 reviews

187,132 users

Never be annoyed by a Flash animation again! Blocks Flash so it won't get in your way, but if you want to see it, just click on...
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