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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

How to Customize the New Mail Sound

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

Install themes to change the look of Thunderbird

Unified Toolbar

Certificates

Add-Ons FAQ

Open Search

Add Search Engine to Open Search

How can I digitally sign and encrypt emails?

Installing and Using another Language in the Dictionary

How to Customize Toolbars

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

Unable to uninstall add-ons (extensions or themes)

userChrome.css and .js and userContent are unsupported

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