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AutoCopy Requires Restart
Select text and it's automatically copied to the clipboard. Also pastes on middle click.
lightningWeather Requires Restart
LightningWeather shows the weather forecast in the background of the calendar so you can easily coordinate your activities with the weather.
Auto Compress File Requires Restart
Compressor for attachment files. All platforms are supported (Windows, Linux and Macintosh).
Classic TB2 Requires Restart
Theme using mostly TB2 icons plus the best of TB1.5, TB3, and later versions.
Metal Lion Silver Sea Monkey Requires Restart
Metal Lion meets SeaMonkey and makes it shine....
Brazilian Portuguese Dictionary (Former Spelling)
The same spellchecker shipped with the Brazilian version of Firefox, just using the former spelling (which is valid until January 1st 2016).
AddressBook in Tab Requires Restart
Adds a button that can be put in toolbars which opens the addressbook in a new tab like pastismans AddressBookTab
Secure Addressing Requires Restart
This add-on provides features to avoid sending emails to wrong addresses. Key features are a confirmation window of recipient's addresses upon sending, name and affiliation look up at mail composition and main windows, and safe auto completion.
Sieve
This Extension implements the ManageSieve protocol for securely managing Sieve Script on a remote IMAP server...
Show All Body Parts Requires Restart
Enable the View | Message Body As | All Body Parts message display mode.
G-Hub Lite
Google Tabs for Thunderbird! G-Hub Lite supports Calendar, Contacts, Drive, Docs, Sheets, Slides, Maps, Search, & Voice. Need Google Workspace support (formerly G Suite)? Check out G-Hub Pro: https://www.schiffner.com/index.php/software/g-hub-pro
Nuvola TB Requires Restart
Theme based on the Nuvola icon set by David Vignoni (http://icon-king.com/?p=15).
You can find developer versions under http://mozilla.paenglab.ch/
To create your own collections, you must have a Mozilla Add-ons account.