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Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Hasiera
Thunderbird
Settings
Add-ons, extensions, and themes

Settings

Add-ons, extensions, and themes

Enhance product functionality with add-ons, extensions, and themes.

In English

Filelink for Large Attachments

Permission request messages for Thunderbird extensions

Thunderbird add-ons - frequently asked questions

Installing an Add-on in Thunderbird

Install themes to change the look of Thunderbird

How to Customize Toolbars

Unable to uninstall add-ons (extensions or themes)

Unable to install add-ons (extensions or themes) in Thunderbird

Certificates

How to Install and Use another Language in the Dictionary on Thunderbird

Add-Ons FAQ

How can I digitally sign and encrypt emails?

Installing and Using another Language in the Dictionary

Install the Thunderbird Pro Add-on in Thunderbird Desktop

Support for add-ons using Experiment APIs in Thunderbird

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