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Most Popular [All »](/en-US/thunderbird/extensions/?sort=users)
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1. [**1.** ImportExportTools NG 275,559 users](/en-US/thunderbird/addon/importexporttools-ng/?src=hp-dl-mostpopular)
2. [**2.** Provider for Google Calendar 193,304 users](/en-US/thunderbird/addon/provider-for-google-calendar/?src=hp-dl-mostpopular)
3. [**3.** LookOut (fix version) 187,370 users](/en-US/thunderbird/addon/lookout-fix-version/?src=hp-dl-mostpopular)
4. [**4.** Quicktext 136,206 users](/en-US/thunderbird/addon/quicktext/?src=hp-dl-mostpopular)
5. [**5.** Send Later 117,443 users](/en-US/thunderbird/addon/send-later-3/?src=hp-dl-mostpopular)
6. [**6.** Remove Duplicate Messages 101,085 users](/en-US/thunderbird/addon/removedupes/?src=hp-dl-mostpopular)
7. [**7.** Mail Merge 78,410 users](/en-US/thunderbird/addon/mail-merge/?src=hp-dl-mostpopular)
8. [**8.** Grammar and Spell Checker — LanguageTool 75,103 users](/en-US/thunderbird/addon/grammar-and-spell-checker/?src=hp-dl-mostpopular)
9. [**9.** CardBook 71,713 users](/en-US/thunderbird/addon/cardbook/?src=hp-dl-mostpopular)
10. [**10.** TbSync 65,243 users](/en-US/thunderbird/addon/tbsync/?src=hp-dl-mostpopular)
Featured Extensions [See all »](/en-US/thunderbird/extensions/?sort=featured)
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* [](/en-US/thunderbird/addon/filelink-nextcloud-owncloud/?src=hp-dl-featured)
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### \*cloud - FileLink for Nextcloud and ownCloud
Message Composition
](/en-US/thunderbird/addon/filelink-nextcloud-owncloud/?src=hp-dl-featured)
Rated 5 out of 5 stars [(54)](/en-US/thunderbird/addon/filelink-nextcloud-owncloud/reviews/)
[Download Now](/thunderbird/downloads/latest/filelink-nextcloud-owncloud/addon-987761-latest.xpi?src=hp-hc-featured)
Works with Thunderbird 68.2.1 - \*
[View other versions](/en-US/thunderbird/addon/987761/versions/)
Upload large attachments to your Cloud and send the link by email
by [Johannes Endres](/en-US/thunderbird/user/anonymous-dff2731a163b17e88ae13415a16d47ce/ "Johannes Endres")
38,855 users
* [](/en-US/thunderbird/addon/filelink-provider-for-webdav/?src=hp-dl-featured)
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### FileLink provider for WebDAV
Miscellaneous
](/en-US/thunderbird/addon/filelink-provider-for-webdav/?src=hp-dl-featured)
Rated 3 out of 5 stars [(23)](/en-US/thunderbird/addon/filelink-provider-for-webdav/reviews/)
[Download Now](/thunderbird/downloads/latest/filelink-provider-for-webdav/addon-986643-latest.xpi?src=hp-hc-featured)
Works with Thunderbird 128.0 - 136.\*
[View other versions](/en-US/thunderbird/addon/986643/versions/)
Uploads your large attachments to your WebDAV account instead of sending them by email.
by [Geoff Lankow](/en-US/thunderbird/user/geoff-lankow/ "Geoff Lankow"), [John Bieling](/en-US/thunderbird/user/jobisoft/ "John Bieling")
47,509 users
* [](/en-US/thunderbird/addon/autoarchivereloaded/?src=hp-dl-featured)
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### AutoarchiveReloaded
Chat and IM
](/en-US/thunderbird/addon/autoarchivereloaded/?src=hp-dl-featured)
Rated 4 out of 5 stars [(28)](/en-US/thunderbird/addon/autoarchivereloaded/reviews/)
[Download Now](/thunderbird/downloads/latest/autoarchivereloaded/addon-477467-latest.xpi?src=hp-hc-featured)
Works with Thunderbird 68.0 - \*
[View other versions](/en-US/thunderbird/addon/477467/versions/)
Automatically archives old mails (Improved version of the orginal Autoarchive Add-on)
by [Brummolix](/en-US/thunderbird/user/Brummolix/ "Brummolix")
25,951 users
* [](/en-US/thunderbird/addon/display-mail-user-agent-t/?src=hp-dl-featured)
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### Display Mail User Agent T
Miscellaneous
](/en-US/thunderbird/addon/display-mail-user-agent-t/?src=hp-dl-featured)
Rated 4 out of 5 stars [(31)](/en-US/thunderbird/addon/display-mail-user-agent-t/reviews/)
[Download Now](/thunderbird/downloads/latest/display-mail-user-agent-t/addon-987719-latest.xpi?src=hp-hc-featured)
Works with Thunderbird 79.0a1 - \*
[View other versions](/en-US/thunderbird/addon/987719/versions/)
Displays the mail program with which the selected mail was written
\*This addon is compatible with Thunderbird after Web Extesnsions support. Since development and operation check are done on Daily, it may not work on normal Thunderbird.
by [Toshi](/en-US/thunderbird/user/Toshi_/ "Toshi")
11,959 users
* [](/en-US/thunderbird/addon/extract-em/?src=hp-dl-featured)
[
### Extract 'Em!
Import/Export
](/en-US/thunderbird/addon/extract-em/?src=hp-dl-featured)
Rated 3 out of 5 stars [(11)](/en-US/thunderbird/addon/extract-em/reviews/)
[Download Now](/thunderbird/downloads/latest/extract-em/addon-988617-latest.xpi?src=hp-hc-featured)
Works with Thunderbird 102.0 - \*
[View other versions](/en-US/thunderbird/addon/988617/versions/)
Extracts attachments from messages within an account or folder, with the option to select specific attachments. By default, extracted attachments are saved to a .zip file.
by [tmccoid.tech](/en-US/thunderbird/user/tmccoid/ "tmccoid.tech")
6,367 users
* [](/en-US/thunderbird/addon/smarttemplate4/?src=hp-dl-featured)
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### SmartTemplates
Message Composition
](/en-US/thunderbird/addon/smarttemplate4/?src=hp-dl-featured)
Rated 4 out of 5 stars [(81)](/en-US/thunderbird/addon/smarttemplate4/reviews/)
[Download Now](/thunderbird/downloads/latest/smarttemplate4/addon-324497-latest.xpi?src=hp-hc-featured)
Works with Thunderbird 111.0 - 135.\*
[View other versions](/en-US/thunderbird/addon/324497/versions/)
SmartTemplates offers an easy and powerful way to automatically create customized replies by auto-inserting various mail headers. Templates can be created for every mail identity, Stationery files can now be imported and used directly.
by [Realraven (Axel Grude)](/en-US/thunderbird/user/realraven/ "Realraven (Axel Grude)"), [Marky Mark DE](/en-US/thunderbird/user/marky-mark-de/ "Marky Mark DE")
4,121 users
Up & Coming Extensions [See all »](/en-US/thunderbird/extensions/?sort=hotness)
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* [](/en-US/thunderbird/addon/thunderbook/?src=hp-dl-upandcoming)
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### Thunderbook
Import/Export
](/en-US/thunderbird/addon/thunderbook/?src=hp-dl-upandcoming)
Rated 4 out of 5 stars [(3)](/en-US/thunderbird/addon/thunderbook/reviews/)
[Download Now](/thunderbird/downloads/latest/thunderbook/addon-728297-latest.xpi?src=hp-hc-upandcoming)
Works with Thunderbird 68.3.0 - 73.0
[View other versions](/en-US/thunderbird/addon/728297/versions/)
Export messages (including RSS items) as e-books.
by [Julien L.](/en-US/thunderbird/user/julien1001/ "Julien L.")
3,165 users
* [](/en-US/thunderbird/addon/attachment-extractor/?src=hp-dl-upandcoming)
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### Attachment Extractor
Import/Export
](/en-US/thunderbird/addon/attachment-extractor/?src=hp-dl-upandcoming)
Rated 3 out of 5 stars [(86)](/en-US/thunderbird/addon/attachment-extractor/reviews/)
[Download Now](/thunderbird/downloads/latest/attachment-extractor/addon-988096-latest.xpi?src=hp-hc-upandcoming)
Works with Thunderbird 125.0 - 130.\*
[View other versions](/en-US/thunderbird/addon/988096/versions/)
Extract attachments from selected e-mails!
Instructions:
1\. Select one or more messages
2\. Right click and choose Attachment Extractor
3\. Select a template for filenames and target folder
4\. Done
by [The Stonehead](/en-US/thunderbird/user/the_stonehead/ "The Stonehead")
7,865 users
* [](/en-US/thunderbird/addon/extract-em/?src=hp-dl-upandcoming)
[
### Extract 'Em!
Import/Export
](/en-US/thunderbird/addon/extract-em/?src=hp-dl-upandcoming)
Rated 3 out of 5 stars [(11)](/en-US/thunderbird/addon/extract-em/reviews/)
[Download Now](/thunderbird/downloads/latest/extract-em/addon-988617-latest.xpi?src=hp-hc-upandcoming)
Works with Thunderbird 102.0 - \*
[View other versions](/en-US/thunderbird/addon/988617/versions/)
Extracts attachments from messages within an account or folder, with the option to select specific attachments. By default, extracted attachments are saved to a .zip file.
by [tmccoid.tech](/en-US/thunderbird/user/tmccoid/ "tmccoid.tech")
6,367 users
* [](/en-US/thunderbird/addon/bidi-mail-ui/?src=hp-dl-upandcoming)
[
### BiDi Mail UI
Message and News Reading
](/en-US/thunderbird/addon/bidi-mail-ui/?src=hp-dl-upandcoming)
Rated 5 out of 5 stars [(54)](/en-US/thunderbird/addon/bidi-mail-ui/reviews/)
[Download Now](/thunderbird/downloads/latest/bidi-mail-ui/addon-310-latest.xpi?src=hp-hc-upandcoming)
Works with Thunderbird 128.0 - 136.\*
[View other versions](/en-US/thunderbird/addon/310/versions/)
Direction control and BiDi-related charset misdetection correction
by [The BiDi UI Team](/en-US/thunderbird/user/the-bidi-ui-team/ "The BiDi UI Team"), [Eyal Rozenberg](/en-US/thunderbird/user/eyalroz/ "Eyal Rozenberg")
1,862 users
* [](/en-US/thunderbird/addon/changequote/?src=hp-dl-upandcoming)
[
### changeQuote
Appearance and Customization
](/en-US/thunderbird/addon/changequote/?src=hp-dl-upandcoming)
Rated 4 out of 5 stars [(26)](/en-US/thunderbird/addon/changequote/reviews/)
[Download Now](/thunderbird/downloads/latest/changequote/addon-987689-latest.xpi?src=hp-hc-upandcoming)
Works with Thunderbird 128.0 - 129.\*
[View other versions](/en-US/thunderbird/addon/987689/versions/)
It's an extension that changes the format of reply header.
You can choose between the standard Thunderbird reply header, a detailed reply header or a Customized reply header.
You can configure it in the Tools ->Add-on Preferences -> changeQuote.
by [caligraf](/en-US/thunderbird/user/caligraf/ "caligraf")
1,880 users
* [](/en-US/thunderbird/addon/calculation-pad/?src=hp-dl-upandcoming)
[
### Calculation Pad
Import/Export
](/en-US/thunderbird/addon/calculation-pad/?src=hp-dl-upandcoming)
**Not yet rated**
[Download Now](/thunderbird/downloads/latest/calculation-pad/addon-988945-latest.xpi?src=hp-hc-upandcoming)
Works with Thunderbird 91.0 - \*
[View other versions](/en-US/thunderbird/addon/988945/versions/)
This extension features a serverless single page application with spreadsheet and plain text pad functions from jQuery and jSpreadsheet for Thunderbird/Firefox/Sea Monkey. Plain text values and formats can be imported or exported to a local device.
by [Jacques47379](/en-US/thunderbird/user/Jacques47379/ "Jacques47379")
0 users
Featured Collections [See all »](/en-US/thunderbird/collections/?sort=featured)
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* [
### Thunderbird Add-ons? Here's Some Great Ones!
Thunderbird add-ons that I've either used for years, or tested and highly suggest.
](/en-US/thunderbird/collections/-Ken-Saunders-/thunderbird/)
61 add-ons
* [
### Mozilla Labs Messaging Add-ons
The add-ons included in this collection are all ones that are part of the messaging category on Mozilla Labs: https://mozillalabs.com/messaging/
](/en-US/thunderbird/collections/anonymous-a5b696206b5f5dc2ae271429ccdea8d3/mozilla-labs-messaging-add-ons/)
3 add-ons
To create your own collections, you must have a Mozilla Add-ons account.
[Create an Add-ons Account](https://oauth.accounts.firefox.com/v1/authorization?action=signup&scope=profile&state=4316845aa0f88068ab0c08c6827ca27f77a8aa88efafa28e9c42224dba95de57%3AL2VuLVVTL3RodW5kZXJiaXJkLw&redirect_url=https%3A%2F%2Faddons.thunderbird.net%2Fapi%2Fv3%2Faccounts%2Fauthenticate%2F&client_id=25691f3bf98f8ea8)
or [log in to your current account](https://oauth.accounts.firefox.com/v1/authorization?action=signin&scope=profile&state=4316845aa0f88068ab0c08c6827ca27f77a8aa88efafa28e9c42224dba95de57%3AL2VuLVVTL3RodW5kZXJiaXJkLw&redirect_url=https%3A%2F%2Faddons.thunderbird.net%2Fapi%2Fv3%2Faccounts%2Fauthenticate%2F&client_id=25691f3bf98f8ea8)
* get to know **add-ons**
* [About](/en-US/about)
* [Blog](https://blog.mozilla.org/thunderbird/)
* [Developer Hub](/en-US/developers/)
* [Forum](https://discourse.mozilla.org/c/thunderbird/addons)
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