by trapet

27 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,799 reviews

2,160,934 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...

Greasemonkey by Anthony Lieuallen, Aaron Boodman, others

Rated 4 out of 5 stars 964 reviews

1,264,120 users

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

User Agent Switcher by chrispederick

Rated 4 out of 5 stars 251 reviews

349,221 users

The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.

Web Developer by chrispederick

Rated 5 out of 5 stars 218 reviews

519,933 users

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

Speed Dial by Josep del Rio

Rated 4 out of 5 stars 1,249 reviews

420,161 users

Direct access to your most visited websites

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

Rated 5 out of 5 stars 439 reviews

258,285 users

FireShot makes full web page screenshots. Demo:

Screenshots can be quickly captured and:

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

* OS Windows only

Xmarks Sync by Xmarks Inc.

Rated 4 out of 5 stars 2,527 reviews

311,139 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!

ColorZilla by Alex Sirota

Rated 5 out of 5 stars 306 reviews

275,953 users

Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...

PDF Download by Nitro PDF Software

Rated 2 out of 5 stars 685 reviews

115,123 users

Use PDF Download to do whatever you like with PDF files on the Web. Regain control and eliminate browser problems, view PDFs directly in Firefox as HTML, and use the all-new Web-to-PDF toolbar to save and share Web pages as high-quality PDF files.

ColorfulTabs by Shivanand Sharma

Rated 4 out of 5 stars 995 reviews

223,393 users

The most beautiful yet the simplest add-on that makes a strong colorful appeal. Colors every tab in a different color and makes them easy to distinguish while beautifying the overall appearance of the interface. For Seamonkey & Flock. An essential. F...

ScrapBook by Gomita

Rated 4 out of 5 stars 856 reviews

163,270 users

Helps you to save Web pages and organize the collection.

MeasureIt by Kevin Freitas

Rated 4 out of 5 stars 341 reviews

140,917 users

Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.

Image Zoom by Jason Adams

Rated 4 out of 5 stars 334 reviews

165,076 users

Adds zoom and rotation functionality for images...

YSlow by YSlow

Rated 3 out of 5 stars 200 reviews

91,669 users

YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. is the official open source website.

Fast Video Download by Applian Technologies

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Rated 3 out of 5 stars 282 reviews

64,720 users

Quickly and easily download video files from popular sites like YouTube, Dailymotion,, etc. For a more powerful free video recorder, install Freecorder at
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