Top-Rated Extensions

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Show SMTP Username

Displays username (if available) next to SMTP...

Rated 1 out of 5 stars (1)
56 users

Flex Confirm Mail

Confirm mail address and attachments based on flexible rules.

Rated 1 out of 5 stars (1)
6,960 users

ToggleFullHeaders

Allows you to customise the message panel buttons to add a "Toggle Headers" button that will switch between showing and hiding the full headers.

Rated 1 out of 5 stars (1)
99 users

Mukparasi

A Korean popup dictionary based on Rikaichan
Requires the additional dictionary addon.

Rated 1 out of 5 stars (1)
20 users

Disable about:config

Disable about:config feature of Firefox and Thunderbird.

Rated 1 out of 5 stars (1)
462 users

Delete Only Empty Folder

Disallows to delete not-empty mail folders.

Not yet rated
1 user

Sensitivity Header + SPX

Implement the "Sensitivity" header for outgoing messages (described in RFC 4021 section 2.1.55).
Forked from another add-on developed by ff_bob, added SPX header for Sophos security appliances

Not yet rated
1 user

RM: EXTERNAL:

Removes 'EXTERNAL: ' from the start of an email subject if it is preceded by 'RE:' or 'FWD:' (case insensitive). The removal is done after the 'Send' button is pressed.

Not yet rated
2 users

Rikaichan Japanese-Hungarian Dictionary File

This is a dictionary file add-on for the Rikaichan extension.

Not yet rated
16 users

InfoQube Firefox extension

Extension to import html into InfoQube

Not yet rated
23 users

Rspamd-spamness

Rspamd spam filtering system score visualization.

Not yet rated
15 users

Complete master password

The goal is to avoid to have to enter the master password on application startUp.
The extension is not self-sufficient, a script has to extract the master for a secure storage like gnome-keyring, then to transfer it through an environment variable.

Not yet rated
1 user

AutoProxy-ng

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

Not yet rated
69 users

Check Attachment before Send

Confirms to send a mail with any attachment.

Not yet rated
1 user

Dialectic Dialer

Dial phone numbers with Dialectic (Dialectic is for OS X only). In addition, when a page loads, phone numbers can optionally be highlighted and hyperlinked to dial Dialectic.

Not yet rated
20 users

DownloadStudio Firefox Integration

Firefox Integration for DownloadStudio

Not yet rated
14 users

DisableChunks

The addon modifies the mail.imap.min_chunk_size_threshold preference value by setting it to 100000000.
It is a workaroud to bug 1216951

Not yet rated
30 users

BccBlocker

A ThunderBird extension to prevent the use of the Bcc field.

Bcc is the worst thing ever.
It kills transparency inside an organization.
If you use the Bcc feature, you should ask yourself why..

Not yet rated
4 users

MEGAbird

Add MEGA support to Thunderbird's Filelink feature.

Not yet rated
72 users

Hide Badge Icon

Hides the badge for new messages of the Thunderbird app icon on Mac OSX.

Not yet rated
4 users