113 317 uživatelů
Cookies manager to view, edit and create new cookies. It also shows extra information about cookies, allows edit multiple cookies at once and backup/restore them.
55 434 uživatelů
82 462 uživatelů
Allows the download manager to also open in a tab or sidebar, and adds some optional display changes.
34 060 uživatelů
Firefox OS Simulator is a test environment for Firefox OS. Use it to test your apps in a Firefox OS-like environment that looks and feels like a mobile phone. After installing it, go to Web Developer > Firefox OS Simulator to access its features.
92 086 uživatelů
Adds the ability to create and edit entries in the password manager.
89 816 uživatelů
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.
27 076 uživatelů
Customizes the new tab page. Add more tiles. Add the launcher from Firefox start. Have a background image. Set new tile images and titles. See recently closed tabs. And more...
75 844 uživatelů
Control what gets sent as the HTTP Referer on a per-site basis.
88 302 uživatelů
Make any pages' search functionality available in the Search Bar (or "search box")...
62 300 uživatelů
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