Up & Coming Extensions

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Open With Google Chrome No Restart

Open With Google Chrome sends pages from Mozilla Firefox to Google Chrome.

Rated 5 out of 5 stars (5)
9,806 users

Free Memory Button No Restart

Free unused memory that Firefox is currently using.

Rated 5 out of 5 stars (2)
2,396 users

Lightning Featured

Organize your schedule and life's important events in a calendar that's fully integrated with your Thunderbird email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.

Rated 3 out of 5 stars (1,851)
3,023,301 users

All Menus Button No Restart

Show all the menus in a single menu button that can be placed anywhere. Also contains replacement buttons for the default menus.

Rated 5 out of 5 stars (4)
1,022 users

uBlock Origin No Restart

Finally, an efficient blocker. Easy on CPU and memory.

Rated 5 out of 5 stars (137)
146,533 users

Bookmark Toolbar Menu Button No Restart

Show the contents of the Bookmarks Toolbar in a drop down menu. This compresses the bookmark menu into one button that you can put on any toolbar you want to.

Rated 5 out of 5 stars (2)
1,144 users

Extra Format Buttons

Adds a font size (in pixels), strikethough, subscript and superscript buttons to Thunderbird's Compose Window.

Rated 5 out of 5 stars (5)
3,304 users

RedirectCleaner No Restart

RedirectCleaner cleans Redirects from Links

Rated 4 out of 5 stars (5)
3,172 users

OpenDownload²

OpenDownload² extends the "Save" dialog by a "Run" button to open the file directly.

Rated 5 out of 5 stars (137)
29,040 users

Sharp Color Picker No Restart

A full featured color selector tool, to work with colors, and easily find the colors you want.

Not yet rated
1,111 users

Forecastfox (fix version)

Get international weather forecasts from AccuWeather.com and display them in any toolbar or statusbar with this highly customizable and unobtrusive extension.

Now Available for: Firefox, Thunderbird and SeaMonkey!

Rated 5 out of 5 stars (125)
28,048 users

Pan No Restart

Block ads and manage proxy.

Rated 5 out of 5 stars (52)
2,180 users

HTML5 Loop

Loop HTML5 Video and Music.

Rated 1 out of 5 stars (13)
1,403 users

GitHub Extension Installer No Restart

Install Browser Extensions straight from GitHub Repositories

Rated 5 out of 5 stars (8)
2,380 users

Mouse Gestures Suite

Mouse gestures for SeaMonkey & Firefox: navigate & execute commands using mouse gestures (with single mouse button) and rocker gestures (by pressing 2 mouse buttons). Also: scroll wheel navigation, page scrolling, tab scrolling.

Rated 5 out of 5 stars (19)
5,739 users

SeaTab-X-2

Adds Firefox-style tab closers into SeaMonkey.

Rated 5 out of 5 stars (15)
1,717 users

Update Channel Selector

Allows you to change the application update channel.

Changing only the channel with Gecko 12 became insufficient because it's "*.mar" related security landings.

Rated 3 out of 5 stars (10)
6,189 users

Black background and white text No Restart

Makes black background and white text on every page

Rated 5 out of 5 stars (21)
4,902 users

Menu Filter No Restart

Keep your menus in check by filtering out items you never use.

Rated 4 out of 5 stars (31)
2,707 users

FlashResizer

Makes Flash Movies/Games Resizable, and other enhancements.

Rated 4 out of 5 stars (27)
11,982 users