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Strip inline images
Adds a button to the compose window to remove inline images from messages. The images are replaced with their filename in angled brackets.
This is helpful when replying to long message threads with lots of embedded images.
Spellchecker Rumantsch Surmiran
Custom Subject Column
Add a column to the message list that replaces the subject with a regular expression
Customoji
Adds easy custom emojis to Thunderbird.
NOTE: you need to add the emojis yourself in the extension settings
GroupMe - Web Tab
Microsoft 365 Link Opener
Open a shared link of a SharePoint or OneDrive file directly with the right app, instead of the browser.
Proton Calendar Toolbar Button
Adds a Proton Calendar button to the toolbar. The button simply opens a new tab with the https://calendar.proton.me webpage.
Open Google Keep
Webbuttons - Skype Web
Adds a button in the toolbar for Skype Web. Icon source: https://www.flaticon.com/free-icon/skype_16167326
Thunderbird Assist
[Closed Alpha Testing] Thunderbird assist provides a summary of new messages in your inbox.
This add-on is undergoing testing and not yet available to the general public.
Beeper Thunderbird Add-on
A simple add-on with a button in the Spaces toolbar.
I created this by reverse engineering one of the many good add-ons in the Mozilla store and replaced the URL with chat.beeper.com and a logo.
Requires an account with beeper.com
Todoist - Quick Access
Quick Access to Todoist in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.
Thunderpocket
Speichere Links aus Thunderbird-E-Mails in Pocket. Klicke einfach mit der rechten Maustaste auf einen Link, logge dich ggf. ein und - zack - fertig!
External Editor Revived
thundersort
Sort incoming mails into account folders based on the local part (based on regex)
Mail Extractor
Mail Extractor for Thunderbird quickly extracts and copies email addresses from selected messages. It now also downloads attachments as ZIP files.
Tok Pisin spell checker
Requires Restart
This is a spell checker for Tok Pisin based on a word list created by Helge Søgaard.
Ogden's Basic English Dictionary for Media
Requires Restart
A spell checker for Ogden's Basic English.
To create your own collections, you must have a Mozilla Add-ons account.
