Block unwanted ads.
Display international weather from AccuWeather.com via Firefox.
Compare 750 car rental companies and find the cheapest prices in 30.000 destinations worldwide.
Add menus and a toolbars with various web developer tools to Firefox.
Get a conversation view for Thunderbird which can integrate with Thunderbird Contacts.
Chat with your friends on Facebook.
Keep your Firefox bookmarks on Windows up to date with your Safari bookmarks on iPhone, iPad, and Mac with the iCloud Bookmarks extension for Firefox.
Tweak your Firefox download window and add more features.
View all your open tabs and windows in Firefox.
Browse, review, and share sites with like-minded people in Firefox.
