Ahrefs SEO Toolbar Requires Restart
Monitor key SEO metrics for individual pages, domains and inside SERPs.
* Ahrefs Rank and Ahrefs Domain Rank
* Backlinks & Referring Domains
* Social metrics for G+, FB and TW
AInspector Sidebar Requires Restart
AInspector Sidebar evaluates the accessibility compliance of web pages based on WCAG 2.0 Level A and AA requirements using OpenAjax Alliance rulesets. It organizes the evaluation results by Rule Categories and WCAG Guidelines.
AJAX Yahoo! Mail [Viamatic WebMail++] Requires Restart
Preview your messages with a single click. Adds AJAX support to the classic Yahoo! mail.
AlertIP Requires Restart
Show IP of the currently loaded web page on demand in an alert prompt. This eliminates computing overhead and DNS caching issues.
AlertStopper Requires Restart
"Google Chrome"-like option for blocking repetitive alert(), confirm() and prompt() dialogs. Gets rid of spam dialogs and other infinite loops!
Alix allows you to lint your HTML for Accessibility issues simply by applying a stylesheet that makes use of advanced CSS selectors.
All About Location Bar Requires Restart
Make URL modification an accurate, smooth and simple experience
All Downloader Professional finds links, images, videos, documents on a website an make them downloadable.
AllBlock Requires Restart
This addon lets you remove any content from any webpage. Just (Ctrl+Shift+Click) on any item on a webpage to instantly remove it.
Or press (Ctrl+Shift+Hyphen) to know what elements are there on the page.
allcookies Requires Restart
Dumps ALL cookies (including session cookies) to Firefox standard cookies.txt file...
Alphanumerator Requires Restart
Convert alphanumeric phone numbers to just numbers. Simply highlight the text, right-click it, and click "Alphanumerate". For example, 1-800-PICK-UPS would be converted to...
ALTintext Requires Restart
This extensions function is included in Advanced Dork...
Ambition Requires Restart
Ambition site open when u click the status bar text
AMF Explorer Requires Restart
AMF Viewing for Firebug.
AmosFrameworkForFirebug Requires Restart
Amos Framework for Firebug Extension allows debugging of applications built with Amos Framework.
Reveal the anchors in a webpage
This addon adds some Android Debug Bridge access to Firefox. It requires access to the adb/adb.exe executable from the Android SDK.
AngScope Requires Restart
Simple Firebug extension that allows you to inspect the AngularJS scope that a DOM element binds to. This is not an official extension by the Angular JS team. It's something I wrote for me and my colleagues, I find it useful and like to share.
AngularBug Requires Restart
Firebug AngularJS scope inspector.
Detects the use of AngularJS on a webpage and gives you an alert when it detects AngularJS. It just gives you a heads up that hey, this site was built with angular, so that might be why its so cool! And if your an angular dev, inspiration!