NiceReader Requires Restart
NiceReader is designed for web reading. You can customize font, color, size, background, specify the elements to read, filiter ad elements, filiter ad strings, automaticaly turn page.
Switch tabs by scrolling with the mouse wheel in the tab bar.
Google Hangouts Web Messenger brings Google Hangouts right into your browser to chat with your friends.
Link Status Redux Requires Restart
Shows an indicator on the status bar in front of the link address when the mouse cursor is over a link to a page you have bookmarked or visited before.
Telegram Web Messenger brings Telegram right into your Firefox Sidebar.
YouTube Video Player Pop Out lets you pop out YouTube videos so that you can watch YouTube videos while you surf.
Open With for Internet Explorer sends pages from Mozilla Firefox to Internet Explorer.
Open With Google Chrome sends pages from Mozilla Firefox to Google Chrome.
SeaMonkey Vertical Tab Bar Requires Restart
Tab bar on the side of the window for SeaMonkey.
Watch videos anywhere in cinema mode without leaving the website you're on.
Stylish Requires Restart
Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Tumblr, and many, many other sites. You can even customize Firefox and other programs themselves.
A full featured color selector tool, to work with colors, and easily find the colors you want.
See more search results etc. on one page, concatenating several pages together...
The Add-ons Manager slims down!
This add-on reduces the height of entries in the Add-on Manager, so you can display more of them at a time.
Tategaki Requires Restart
Tategaki allows vertical writing-mode on mail compose window.
enlarging the navigation links on the pages
Block advertisement and access to adult sites