Recently Updated Extensions
WebRTC Permissions UI Toggle Requires Restart
A toolbar button for SeaMonkey to bypass the missing WebRTC permissions dialog and temporarily allow media capture.
Header Tools Lite Requires Restart
Allows to modify the header and the source of messages
Webmaster SAPE Requires Restart
Toolbar contains a set of functions, which expands the abilities of webmasters and optimizers, when working in the interface of SAPE exchange.
Web Messenger for WhatsApp™ brings web messenger right into your browser to chat with your friends.
Toolbar Button for Facebook™ lets you visit your favorite Facebook™ quickly and easily by adding a special button to your Toolbar.
Messenger for Facebook™ lets you bring a Messenger right into your browser to chat with your friends.
YouTube High Definition is a powerful tool that will let you automatically play all YouTube videos in HD (High Definition), turn off annotations, change video player size, auto stop videos, auto mute videos, control embedded videos and much more.
Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...
HTTPS Everywhere Requires Restart
Encrypt the web! HTTPS Everywhere is a Firefox extension to protect your communications by enabling HTTPS encryption automatically on sites that are known to support it, even when you type URLs or follow links that omit the https: prefix.
PlayFlash 64bit Requires Restart
Flash player plugin - unofficial xpi repack for 64bit browsers. Use when official plugin installer is not suitable. All binary files are copyrighted by their authors and distributed for free.
PlayFlash 32bit Requires Restart
Flash player plugin - unofficial xpi repack for 32bit browsers.
Use when official plugin installer is not suitable.
All binary files are copyrighted by their authors and distributed for free.
Finally, an efficient blocker. Easy on CPU and memory.
YouTube Flash Video Player is a powerful tool that will let you choose Flash video player as default YouTube video player.
Get a faster browsing experience by blocking nasty web resources using Bluhell Firewall, the lightweight Ad-Blocker and Tracking/Privacy Protector.
Stylish-Custom Requires Restart
custom additions to Stylish extension
Save images and pages to your Pinterest account quickly and easily with Save Button for Pinterest.
Reader is the ultimate Reader tool for Firefox.
'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions.
Beta builds on versions page!
Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.
fixedzoomthumb Requires Restart
Shows fixed size image when you hover over a thumbnail and it is permanent till we don't hover anywhere on a web page. Press s to save the image directly.Works with many sites including Amazon, Facebook, Flickr, YouTube.