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Google Keep Tab
Rescue Conflicting Alternatives
Renders conflicting alternative bodies if the message has them.
iOS IMAP Notes
This addon allows to edit notes iOS notes within TB. The legacy version was mostly based on code derived from the "Header Tools Lite" by Paolo Kaosmos and OPTO. The WebExtension version for TB 115 and later was created with support from John Bieling.
Expertspam
Mail Sent Notifier
Allows to notify a HTTP-GET based webservice after successfully sent an email, e.g. for time registration systems.
Open Google Tasks
URL Link
URL Link is a small Thunderbird extension that allows you to select a non-URL in a mail/news message or web-page, and open it in a browser window.
Open With
Open With can open your web links in any browser installed on your computer.
*Open With is no longer maintained.*
White Screen
Use white screen test to detect dead pixels, stuck pixels, and other display defects.
Black Screen
Use black screen test to detect dead pixels, stuck pixels, and other display defects.
Google Keep - Quick Access
Quick Access to Google Keep in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.
New Tab
Skiff Mail
Integrates a Skiff Mail button into the Spaces toolbar. It opens the Skiff Mail website in a new tab.
Telegram - Quick Access
Quick Access to Telegram Web in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.
Bard - Quick Access
Quick Access to Google Bard (new name Gemini) in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.
Google Calendar - Quick Access
Quick Access to Google Calendar in a new tab with just one click on a simple, stylish icon button on your Spaces toolbar.
To create your own collections, you must have a Mozilla Add-ons account.
