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GCalTab

GCalTab is a Thunderbird add-on that opens Google Calendar website in a Thunderbird tab. It features a beautiful dark mode thanks to the DarkReader algorithm.

Rated 5 out of 5 stars (12)
1,767 users

ResizeTbWidth

Resize Thunderbird window width.
Set window with three widths (1/1 (1920px), 1/2 (960px), 1/3 (640px)).

July 3rd 2021.

I love God.

Sungho.

Not yet rated
70 users

FileLink provider for Send

Securely encrypt and upload large attachments to any Send service instance (formerly Firefox Send).

Rated 5 out of 5 stars (17)
50,621 users

Click Speed Tester

Test your click speed and practice different clicking techniques.

Not yet rated
4 users

Text Insert: Templates/Instant Spell Check

Email composer:

*Upper case the first letter of nouns, names, or words at sentence start
*Android(TM) like spellcheck/suggest alternatives (DE, EN, ES, FR,NL)
*Insert styled text, images, tables with shortcuts
*Define shortcut-replacements.

Rated 3 out of 5 stars (7)
278 users

Google Calendar Tab

Adds a button to open Google Calendar in a new Tab

Rated 4 out of 5 stars (17)
8,503 users

Toggle Message Pane

Adds a Preview Button, toggles the message preview

Rated 5 out of 5 stars (8)
567 users

British-English Dictionary (GB)

A strict British-English spell checker dictionary for Firefox, Thunderbird and SeaMonkey. This dictionary only includes words conforming to the preferred standard of British-English spelling.

Rated 5 out of 5 stars (2)
29,637 users

quicker quicksearch

make searching for emails faster:

Automatically insert into the quickfilter box: the author, subject or the email domain of the selected email.


No need to retype the address, if you want to search for all emails of this author.

Rated 4 out of 5 stars (8)
1,251 users

vault56 protection

vault56 protection protects against potentially malicious attached files and links. Links are rewritten to pass through vault56 URL protection servers and checked for trackers and malicious activity.

Rated 5 out of 5 stars (2)
59 users

Spellchecker Rumantsch Sutsilvan

Spellchecker Rumantsch Sutsilvan

Not yet rated
4 users

Customoji

Adds easy custom emojis to Thunderbird.

NOTE: you need to add the emojis yourself in the extension settings

Not yet rated
30 users

GroupMe - Web Tab

This extensions opens a Thunderbird tab for the GroupMe web interface.

Not yet rated
11 users

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

Rated 5 out of 5 stars (1)
18 users

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.

Rated 5 out of 5 stars (1)
150 users

Webbuttons - Skype Web

Adds a button in the toolbar for Skype Web. Icon source: https://www.flaticon.com/free-icon/skype_16167326

Not yet rated
21 users

Calendar Tools: Gantt-/ Year View, Time Planner

Display Gantt View and Year View
Task Time Planning: daily, distribute your open tasks into open time slots.

Rated 5 out of 5 stars (1)
144 users

AutoRemove

Remove specific mail addresses from To:, Cc: and Bcc:

Not yet rated
4 users

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.

Rated 5 out of 5 stars (8)
795 users

Microsoft 365 Link Opener

Open a shared link of a SharePoint or OneDrive file directly with the right app, instead of the browser.

Rated 5 out of 5 stars (1)
246 users