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.
This addon provides a conversation view for Thunderbird, grouping messages together and allowing you to reply "inline" thus providing a more efficient workflow.
The latest version is compatible with Thunderbird 38+ only (see below for details).
This extension is for those TB3 users who want the multiple-columns view that TB2 allowed
Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).
Extracts all attachments from selected messages and then can delete, detach or mark-read.
Check the message contents and addresses before you send the message...
Empties the Trash and Junk folders, and compacts folders in multiple Thunderbird accounts.
Collapse and expand quotes. Please see the extension homepage for...
Quote Colors allows you to select text and background colors of different quote levels which are applied when reading or printing mail/news messages. Additionally, you can choose between graphical and traditional plain text quoting display mode.
This extension adds a context menu item for selected text that provides more information (from the Unicode database) about the characters...