You don't need to leave the app to change your look. Follow these steps to install themes directly within Thunderbird:
Brighten your inbox with themes like Greeny Lemon or Autumn Blush . download thunderbird themes
For something unique, try Retro Cyborg or fan favorites like the Parasol Totoro theme. How to Install and Apply Your Themes You don't need to leave the app to change your look
The primary and safest place to download themes is the , where thousands of community-created designs are vetted for security and performance. Popular categories you can browse include: How to Install and Apply Your Themes The
Click the Menu button (the three horizontal lines) in the top right corner and select Add-ons and Themes .
Your newly downloaded theme will apply immediately. You can switch back to previous themes or the default System Theme (which follows your OS settings) by clicking Enable next to any theme in your manager. A Note on "Complete Themes"
While browsing older tutorials, you might see mentions of "Complete Themes" that change every icon and button in the client. However, since , these deep-level themes are no longer supported for stability reasons. Modern themes focus on toolbar backgrounds, text colors, and general interface hues to ensure they work smoothly across all operating systems. Install themes to change the look of Thunderbird