A Mozilla Thunderbird CSS theme
This theme adds rounding and floating panes to Thunderbird's GUI, making for a much more modern UI. It also includes more creative usage of your selected Thunderbird theme color, implementing a gradient background to be placed behind all the floating panes.
This theme is compatible with native Thunderbird themes, in both light-mode and dark-mode.
Download all the files in this repository, either through git clone or downloading directly from GitHub.
Place the files from this repo inside the chrome folder of your Thunderbird profile:
.../Thunderbird/Profiles/<PROFILE_NAME>/chrome/
If you're unsure where your profile folder is, you can find it inside Thunderbird: Help > Troubleshooting Information > about:profiles > Open Folder
If there is no chrome folder here, you can create one.
Afterwards, restart Thunderbird, and you should see the changes.