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dictCheck Requires Restart
dictCheck - Double click on any english word in a page to get the polish meaning. Uses fast online dictionary.
Simple and easy! Enjoy!
Ethical signature Requires Restart
Add a button to the email composition toolbar, which lets you insert an ethical signature.
Check Domain Requires Restart
This extension is to display the warning dialog when you send mail for multiple domains.
Thunderbird Biff Requires Restart
This add-on provides a visual indicator of new Thunderbird mail availability in supported clients (Firefox, Sunbird) and Thunderbird itself. Note: you MUST install this add-on in BOTH Thunderbird and supported clients as there are both client AND ser...
Greek - English (US) Spelling dictionary
Combined Greek - English (US) spell checking dictionary for Firefox - Thunderbird - Seamonkey
Zindus Requires Restart
Google and Zimbra contact sync for Thunderbird. (TB 24 and above NOT supported)
Address Move Button Requires Restart
Allow you to add a Address Move Button to mail compose window.
DOM Inspector Plus! [dm] Requires Restart
Improved DOM Inspector! [dm version]. Box Model new layout & more data, see screenshot!. Horizontal scroll for Dom-Tree, and some more.
Inspects the structure and properties of a window and its contents.
QFO - Quick Fuck Off Requires Restart
This extension serves the purpose of providing instant access to the FOAAS web service. FOAAS (Fuck Off As A Service) provides a modern, RESTful, scalable solution to the common problem of telling people to fuck off.
Extra Folder Columns Requires Restart
This extension is for those TB3 users who want the multiple-columns view that TB2 allowed
IMPORTANT: If you are using Thunderbird 38 or later, uninstall this addon. The functionality is in core now.
PitchDark for TB Requires Restart
Dark-colored minimalistic theme with emphasis on visibility, usability and maximum screen real estate.
Český slovník kontroly pravopisu (bez diakritiky)
Slovník pro kontrolu pravopisu u textů bez diakritiky pro aplikace Mozilla
Thunderbird Taiga Integration Requires Restart
Convert mails to user stories, tasks and tickets for the Taiga project management system. See https://pehei.de/post/thunderbird-taiga-integration for instructions.
Hide Menubar Requires Restart
Supports to hide Menu Bar automatically, you can press the ALT key to show it temporarily.
Any Confirmation Message before Send Requires Restart
You can set Any Confirmation Message before Send.
Forward Requires Restart
Add Inline / As Attachment option to Forward button and Message context menu.
To create your own collections, you must have a Mozilla Add-ons account.