Majestic Backlink Analyzer gives instant insight into the number of backlinks and domains linking to the URL and domain you are currently browsing. Majestic users can drill down to see the links, topics and add them to their Majestic bucket list.
WCAG Contrast checker Requires Restart
Checks for compliance with the contrast levels, brightness and shine in the color combination of foreground and background of textual content based on the requirements of WCAG 1 and WCAG 2.
Website City + Country Info Requires Restart
Shows the city (!) and the countryflag of the website you are browsing to. See IP, provider, Oranisation name, GEO coordinates and further useful infos for security, fun and SEO reasons.
Firesizer Requires Restart
Allows you to resize the window to specific dimensions.
NOTE: Users of Firefox 29 and above must install "The Addon Bar" extension to use this, as Firesizer uses the add-on bar that has been removed in Firefox 29.
Whois & Flags Firefox & Websites Popularity Rating Requires Restart
Display Country Flag indicating Website Physical Location (Country, State, City). Website Popularity (Live Visitor Statistics). Shows how many users are visiting any World Website per day. Website IP IPv6 Addresses, DNS, Hosting. IP Whois Lookup
Tamper Data Icon Redux Requires Restart
Open Tamper Data with a toolbar icon, an item in the Tools menu, or from an item in the Web Developer menu in 6+.
Accessibility Evaluation Toolbar Requires Restart
Support web developers in testing web resources for accessibility features.
Chrome View Requires Restart
Open a page in Google Chrome (or SRware Iron) on Windows.
PageRank Requires Restart
Faster | Lighter | Simpler. A very light weight addon to check Google PageRank and Alexa traffic rank for Mozilla Firefox.
lori (Life-of-request info) Requires Restart
'lori' can tell you how long it takes to load
a page. Useful for web developers who are working on profiling, optimizing a web site.
Manages the Click-to-Play domain whitelist.
Firediff Requires Restart
Track Changes in Firebug
RefControl Requires Restart
Control what gets sent as the HTTP Referer on a per-site basis.
A free extension of the web tool https://emojikeyboard.org. It helps input emoji in the web browser with an extensive search functionality.
As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.
FirePHP Requires Restart
FirePHP enables you to log to your Firebug Console using a simple PHP method call.
Not using Firebug 1.9+ on Firefox 8+? See http://firephp.org/
PageRank Client Requires Restart
PageRank Client is a simple extension for displaying the Google PageRank of the websites you're visiting.
Omnibug Requires Restart
Firebug extension for web analytics testing and debugging
A simple tool to help you check xml document in Firefox.
L-Square Responsive Design Inspector Requires Restart
Browser pixel rulers to help inspect window widths of adaptive designs. The add-on button acts as a toggle that adds rulers similar to a graphics app to measure the current window resolution.