Blocks annoying video ads on YouTube, Facebook ads, banners and much more.
Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
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.
OpenPGP message encryption and authentication for Thunderbird and SeaMonkey.
Google and Zimbra contact sync for Thunderbird. (TB 24 and above NOT supported)
Add symbol in header plane to switch between compact and expanded view. Options to switch between one or two lines compact view, which buttons should be displayed in header pane. Linkify RSS subject. Optionally darkens header if message has focus.
Did your friend send you a cool link? Want to read the rest of that interesting article? Don't want to open up your web browser just to view it? You don't have to! Just view it in Thunderbird with ThunderBrowse!
Extracts all attachments from selected messages and then can delete, detach or mark-read.
This Noia 2 eXtreme theme v3.x version has been completely rewritten / v2.x (which is still available but no more compatible recent Thunderbird versions). Some options are available through an associated extension.
Icon set by Carlitus.
KeyManager Tool: Firefox Add-on for Key Generation, Certificate Enrollment, CRL Signing, and Identity and Authority Delegation