To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!Close
Welcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.Close
Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.
McAfee Security Scan Plus detection No Restart
This extension allows Adobe installers to detect McAfee Security Scan Plus software is installed on your PC.
An HTTP analyzer addon for Firefox
Save an image of a web page (including Flash content) to a file. Web page screenshots may be captured interactively or from the command line. Options allow you to control the output format (PNG or JPEG), image file name, scaling, and much more.
Seoquake is a Firefox SEO extension aimed primarily at helping web masters who deal with search engine optimization (SEO), social media optimization (SMO) and internet promotion. Seoquake allows to investigate many important SEO parameters.
Control what gets sent as the HTTP Referer on a per-site basis.
Lets you load pages in IE with a single right-click, or mark certain sites to *always* load in IE.
Remote XUL Manager No Restart
Manages the Remote XUL whitelist to allow websites and local files to load XUL content.
Gives a possibility to create custom toolbarbuttons...
FirePath is a Firebug extension that adds a development tool to edit, inspect and generate XPath 1.0 expressions, CSS 3 selectors and JQuery selectors (Sizzle selector engine).
Show the IP address of the current page in the status bar. It also allows querying custom information services by IP (right click) and see location and avaiable vouchers for shopping sites. Additionally you can copy the IP address to the clipboard.
The greatest user script engine on the Internet (a fork of Greasemonkey).
Wappalyzer No Restart
Wappalyzer is a browser extension that identifies software on websites.
Empty Cache Button Featured
Cache clearing made easy. One click.
Autofill Forms enables you to fill out web forms with one click.
colorPicker No Restart
A very simple extension for learning web page colors. Copy the RGB or Hex color code of any pixel displayed in your browser to the clipboard (in CSS/HTML format). Similar in function to Internet Explorer's color picker.
User Agent Overrider No Restart
Override browser user agent string
Embeds Internet Explorer(IE) to use the powerful Firefox add-ons.
Not only an enhanced IE Tab, but also an enhanced Internet Explorer with Adblock Plus and FireGestures support.
Switch to the IE engine in one click and dismiss your IE.
HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon
For Online HTML 5 validation, you need 0.962