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Auto Compress File Requires Restart

Compressor for attachment files. All platforms are supported (Windows, Linux and Macintosh).

Rated 5 out of 5 stars (18)
3,936 users
Updated September 18, 2017

Classic Toolbar Buttons

'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions.

Beta builds on versions page!

Rated 5 out of 5 stars (133)
29,738 users
Updated September 13, 2017

Thunderbird Integration for JIRA Requires Restart

This is a plugin for Thunderbird 3.3+ which is able to create Atlassian Jira issues out of e-mails or add the content of an e-mail as a comment on an Jira issue.

Rated 4 out of 5 stars (10)
353 users
Updated September 8, 2017

Shrunked Image Resizer Requires Restart

Make your photos smaller, so they don't take forever to email or send to websites.

This extension is not being converted to a WebExtension.

Rated 4 out of 5 stars (31)
7,920 users
Updated September 8, 2017

LaTeX It! Requires Restart

This addons allows you to write LaTeX expressions in your emails such as $x^2$ or $$\sum_{x=0}\infty$$ and have them all replaced by a PNG image with the corresponding formula inside.

Rated 4 out of 5 stars (26)
1,971 users
Updated September 6, 2017

Profile Folder Button

Adds profile folder/directory button.

Rated 4 out of 5 stars (2)
1,091 users
Updated August 9, 2017

AutoConfiguration Hook Requires Restart

Provides ability to create E-mail accounts for specific ISP via the account creation wizard.

Not yet rated
4,805 users
Updated July 21, 2017

GPO support For Firefox and Thunderbird

Firefox and Thunderbird extension to manage user preferences and user profile CA certificates using group policy

Rated 4 out of 5 stars (12)
26,889 users
Updated July 14, 2017

adaware ad block

By blocking annoying ads and nosy trackers, adaware ad block nearly doubles your browsing speed! And with the most robust antivirus-level cloud-scanning technology of any ad blocker on the market, you’ll be safe from the latest cyber-threats.

Rated 4 out of 5 stars (66)
84,863 users
Updated July 13, 2017

Rescue Conflicting Alternatives Requires Restart

Converts a mail with conflicting alternative bodes to regular multipart mail.

Not yet rated
19 users
Updated July 11, 2017

techblocker

Search with Joy! Block Ads While Surfing!

Rated 5 out of 5 stars (2)
20 users
Updated July 7, 2017

AutoProxy-ng Requires Restart

This is a fork of AutoProxy, which can run the latest version of Firefox.

Rated 5 out of 5 stars (30)
4,069 users
Updated July 4, 2017

dwMailCopy Requires Restart

This add-on is help for create the mail division. This add-on is converting to "(2/5)" from the string "(1/5)" in E-mail subject, after copy the mail. After now, Will be freed from onerous copy-paste work.

Not yet rated
117 users
Updated June 12, 2017

UnMHT

UnMHT allows you to view MHT (MHTML) web archive format files, and save complete web pages, including text and graphics, into a single MHT file in Firefox/SeaMonkey.

Rated 4 out of 5 stars (244)
83,415 users
Updated June 10, 2017

Subject Manager Requires Restart

Manages subject of composed emails.

Rated 5 out of 5 stars (12)
2,313 users
Updated June 8, 2017

Tiny JavaScript Debugger Requires Restart

TinyJSD is a JavaScript debugger for privileged code running Mozilla products like Firefox, Thunderbird, SeaMonkey. It serves to debug the application as well as extensions written in JavaScript.

Rated 4 out of 5 stars (8)
24,959 users
Updated May 29, 2017

Link Properties Plus Requires Restart

Provides extended link properties: size of linked file, last modified time, etc.

Rated 5 out of 5 stars (15)
1,278 users
Updated May 28, 2017

Mail Redirect Requires Restart Featured

Allow to redirect (a.k.a. "remail") mail messages to other recipients.

Rated 4 out of 5 stars (125)
35,158 users
Updated May 17, 2017

Nightly Tester Tools Requires Restart

Useful tools for the nightly tester.

Rated 4 out of 5 stars (187)
15,830 users
Updated May 16, 2017

ThunderKeepPlus

Google Keep for Thunderbird

Rated 5 out of 5 stars (6)
1,920 users
Updated May 10, 2017