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Thunderbird Conversations No Restart

This addon provides a conversation view for Thunderbird, grouping messages together and allowing you to reply "inline" thus providing a more efficient workflow.

The latest version is compatible with Thunderbird 24+ only (see below for details).

Rated 4 out of 5 stars (324)
86,723 users

Custom Buttons

Gives a possibility to create custom toolbarbuttons...

Rated 4 out of 5 stars (70)
83,633 users

Exif Viewer

Displays the Exif and IPTC data in local and remote JPEG images.

Rated 4 out of 5 stars (78)
82,110 users

Quicktext

Quicktext is an extension for Thunderbird that lets you create templates that can be easily inserted into your own emails.

Rated 5 out of 5 stars (220)
80,591 users

Manually sort folders

This extension allows you to manually sort (order) your folders in the folder pane of Thunderbird or automatically sort them, but in a better way. This extension also allows you to re-order accounts in the folder pane.

Rated 4 out of 5 stars (80)
69,741 users

Google Docs Viewer (PDF, DOCX, PPTX, XLSX, etc...)

View publicly-accessible PDF, DOCX, PPTX, XLSX, among other files online with Google Docs by only 2 clicks. Click as usual for your default viewer. Support bookmarked URLs. Security and your explicit viewing intention are always honored.

Rated 4 out of 5 stars (50)
68,789 users

Remove Duplicate Messages (Alternate)

Search and remove messages which are the same as other messages in your mail folders (referred to as duplicates or dupes).

Rated 4 out of 5 stars (131)
67,951 users

Google Calendar Tab

Adds the Google Calendar web interface as a new tab directly into Thunderbird. Creating and viewing events works just as it would in a browser like Firefox

Rated 4 out of 5 stars (67)
65,225 users

Disable Add-on Compatibility Checks No Restart

Reinstates the extensions.checkCompatibility preference without respect to the current application version.

Rated 4 out of 5 stars (82)
59,017 users

Dr.Web LinkChecker

This plugin allows you to check any file you are about to download, any page you are about to visit with online version of Dr.Web anti-virus.

Rated 4 out of 5 stars (80)
57,950 users

SmoothWheel

Scrolls the page smoothly when scrolling the mouse wheel (or keyboard arrows if enabled).

Rated 5 out of 5 stars (232)
55,341 users

Nightly Tester Tools

Useful tools for the nightly tester.

Rated 4 out of 5 stars (182)
55,319 users

Folderpane Tools

Allows for customization of the folder pane. Accounts can be rearranged and the startup folder can be chosen.

Rated 4 out of 5 stars (103)
54,956 users

Zindus Featured

Google and Zimbra contact sync for Thunderbird. (TB 24 and above NOT supported)

Rated 4 out of 5 stars (196)
53,930 users

rikaichan

Japanese to English/German/French/Russian dictionary. Just hover the mouse on top of a word, and a popup appears. Automatically de-inflects verbs and adjectives. Detailed kanji view...

Rated 5 out of 5 stars (79)
49,758 users

Gmail Twitter & Facebook Signature - WiseStamp

Using Gmail? Google mail? Yahoo? Hotmail or Thunderbird? Empower your email with your Twitter, Facebook, LinkedIn, Youtube, eBay item and many more apps...Create a powerful & effective email signature that dose the job ☛ Get it now!

Rated 4 out of 5 stars (281)
47,865 users

Confirm-Address

Confirm E-mail address before sending mail

Rated 4 out of 5 stars (25)
47,660 users

新同文堂 (New Tong Wen Tang)

NewTongWenTang is a tool to switch display Chinese content between traditional and simplified glyphs (中文繁簡體互轉工具)

Rated 4 out of 5 stars (84)
47,509 users

Send Later

True "Send Later" functionality to schedule the time for sending an email.

Rated 5 out of 5 stars (45)
46,585 users

Remove Duplicate Messages

If you have duplicate messages (e.g. from merging folders or downloading messages several times) you can use this tool to find and remove them from the selected folder and its subfolder by rightclicking on a folder and choosing "Remove duplicates..."

Rated 4 out of 5 stars (103)
46,028 users