Web Development

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ColorZilla

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

Rated 5 out of 5 stars (309)
251,999 users

Element Inspector No Restart

In the DOM Inspector,quickly navigate to the any elements

Rated 5 out of 5 stars (28)
3,436 users

Aardvark

Cool utility for cleaning up a page (for printing or better viewing) as well as for web development. Displays a red rectangle on the element under the mouse -- hit "w" to go wider (get the containing element), then hit other keystrokes to remove, etc

Rated 5 out of 5 stars (155)
1,074 users

Document Map

Displays the current page's heading structure in the sidebar, allowing rapid navigation between...

Rated 5 out of 5 stars (16)
36 users

Goog All Sites & Similar Sites Search

Now you don't have to rely on a website's search any more, rather use this website-specific Google search. Bonus is Similar site search. Just on a click, it gets you the list of websites similar to the one opened in active tab.

Rated 5 out of 5 stars (6)
809 users

Pic Style - Checkerboard

Add a checkerboard background on Firefox view image pages to help show image transparency.

Rated 5 out of 5 stars (6)
35 users

Easy Copy Featured

Copy links to a page with one click, ready to paste anywhere else, eg. emails, blogs, forums and Twitter. Copy a single page, all open tabs or all links on a page.

Rated 5 out of 5 stars (35)
16,555 users

Disable WebRTC No Restart

WebRTC leaks your actual IP addresses from behind your VPN, by default.

Rated 5 out of 5 stars (29)
37,286 users

Auto Reload

Reload page automatically when selected local files are changed.

Rated 5 out of 5 stars (66)
15,691 users

SEO Toolbar

The SEO Toolbar shows PageRank, Alexa, Popularity Index, Compete & SEMRush Rank for any website you visit - all on the one toolbar. Other SEO features include Search Engine view, server header view, Wayback Machine button and handy website links.

Rated 5 out of 5 stars (9)
6,118 users

Selenium IDE

Selenium IDE is an integrated development environment for Selenium tests. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests.

Rated 5 out of 5 stars (9)
84,686 users

Dafizilla Table2Clipboard

Mozilla applications allow to select rows and columns from a table simply pressing Control key and picking rows/columns with left mouse button.
The selection can be copied to clipboard but the original table disposition is lost making ugly results wh...

Rated 5 out of 5 stars (63)
17,221 users

PixelZoomer

PixelZoomer takes a screenshot of the current website and provides various tools for pixel analysis. You can zoom into websites (up to 3200%), measure distances and pick colors with an eye dropper.

PixelZoomer requires Firefox 3.6 or higher.

Rated 5 out of 5 stars (23)
5,419 users

Link And Forminfo

Restore Linkinfo and FormInfo which has been deleted from PageInfo of Firefox3.

NOTE:
This extension does not seem to work on MAC.

Rated 5 out of 5 stars (24)
1,241 users

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)
1,029 users

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)
16,808 users

Extended Copy Menu (fix version)

Provides the option to copy selection as plain text or html.

Rated 5 out of 5 stars (18)
3,470 users

Cookie Exporter

Exports all cookies in IE manner.
Makes a Netscape standard cookies.txt file.
Very useful for WGET --load-cookies option.

Rated 5 out of 5 stars (13)
4,673 users

HttpRequester

A tool for easily making HTTP requests (GET/PUT/POST/DELETE), viewing the responses, and keeping a history of transactions.

Rated 5 out of 5 stars (53)
80,533 users

Affilorama SEO Toolbar

The Affilorama Firefox SEO Toolbar provides you with useful information and data to make the analysis of domains and pages super easy.

Rated 5 out of 5 stars (11)
433 users