Settings Add-ons, extensions, and themes Enhance product functionality with add-ons, extensions, and themes. Visi All articles and threads Import and export settings Add-ons, extensions, and themes Anglų kalba 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 Install themes to change the look of Thunderbird Open Search How to Customize Toolbars Unable to install add-ons (extensions or themes) in Thunderbird Unified Toolbar Certificates How to Install and Use another Language in the Dictionary on Thunderbird Add-Ons FAQ Add Search Engine to Open Search How can I digitally sign and encrypt emails? Installing and Using another Language in the Dictionary Unable to uninstall add-ons (extensions or themes) userChrome.css and .js and userContent are unsupported