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Screengrab (fix version) Featured

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

Rated 5 out of 5 stars (249)
143,716 users

Omnibug

Firebug extension for web analytics testing and debugging

Rated 4 out of 5 stars (4)
4,346 users

RefreshBlocker

RefreshBlocker is a small extension for the Firefox web browser. This extension will prevent your browser from following the forwarding specified by the refresh parameter of the META tag element.

Rated 3 out of 5 stars (54)
4,505 users

GA? - Is Google Analytics Installed

Checks to see if Google Analytics is installed on any given page.

Rated 4 out of 5 stars (24)
2,692 users

qSnap - Screen Capture, Screenshots, Annotation

Capture multiple Web pages, crop, annotate, add callouts, add notes, cover sensitive information. Save files to our free hosting service. Share a file URL or save locally to your computer. Completely free!

Rated 4 out of 5 stars (10)
1,727 users

Export Cookies

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 (29)
8,584 users

NoRedirect

NoRedirect lets the user take control of HTTP redirects. It can be used to interdict an ISP's DNS search redirection hijacks, preview/screen "shortened" URLs (e.g., TinyURL), stop the annoying redirection of "smart" error pages, etc.

Rated 4 out of 5 stars (49)
12,109 users

OperaView

Open pages in Opera from Firefox context menus. Very usefull for web developers!

Rated 4 out of 5 stars (32)
1,767 users

Word Count Tool No Restart

Counting the number of words, characters without any extra clicks. Just select the text and the statistics appears in the top right of the toolbar. It gives detail report about the numbers of sentences, paragraphs, average lengths, keyword density...

Rated 4 out of 5 stars (23)
3,041 users

SpellcheckEverything

This AddOn makes it possible to use Firefox-Spellchecker not only within forms but throughout whole webpages by just one click. This happens by changing the window's contentEditable to 'true'. (A "SpellCheck" button will appear in the statusbar.)

Rated 4 out of 5 stars (11)
1,116 users

BetterPrivacy Featured

Remove or manage a new and uncommon kind of cookies, better known as LSO's.The BetterPrivacy safeguard offers various ways to handle Flash-cookies set by Google, YouTube, Ebay and others...

Latest updates: See bottom link 'version history'!

Rated 5 out of 5 stars (429)
569,049 users

Element Inspector No Restart

Shift-RightClick any element to open it in DOM Inspector.

Rated 5 out of 5 stars (26)
2,500 users

Header Tool

Open in a sidebar or in a tab and write headers directly. Simplicity, JS substitution, built-in functions, encryption, and regexp support.
You can easy modify header on each HTTP call on the Mozilla Firefox.

Rated 3 out of 5 stars (15)
3,807 users

SERPTrends SEO Extension

SEO Extension SERPTrends for Firefox is a lightweight SEO tool which shows dynamics for the search results within the search page: whether the website moved up, down in the SERP, just appeared (is "new") or hasn't changed its position.

Rated 5 out of 5 stars (2)
2,050 users

Spell Checker

Checks the (whole) web page (and not the text inside edit box) for spelling mistakes and highlights it.

Rated 3 out of 5 stars (76)
17,070 users

IE Tab V2 (Enhanced IE Tab)

Note: If you are encountering the Connecting... problem see instructions below.

The updated, fully supported IE Tab. Embed IE in a Firefox tab. IE Tab Features: FF 4+ support, IE 7-9 compatibility modes, old IE Tab settings import.

Rated 4 out of 5 stars (415)
559,713 users

FireFile No Restart

Firebug extension to save the CSS files edited with firebug live to your web server. That makes Firebug become the first remote-save live-preview CSS editor and allows ultra-fast webdesign and prototyping.

Rated 4 out of 5 stars (66)
3,100 users

HTTP Header Mangler No Restart

HTTP Header Mangler inserts HTTP headers on a per host basis.

Rated 4 out of 5 stars (5)
1,490 users

Browser View

Open links, pages, and bookmarks in any other browser, using right-click context menus or with one click of the drop-down or standalone toolbar buttons. Modify any menu, browser name or location. Incognito/private browsing mode is also supported.

Rated 4 out of 5 stars (40)
1,716 users

Classic Toolbar Buttons No Restart Featured

'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 (141)
40,183 users