Change Thunderbird background color

To change the background color for Thunderbird message pane, which seems
not to be possible via the UI, do the following:
* Access the configuration editor via Preferences > Config Editor
* Change the value of the setting "browser.display.background_color"

Enable encrypted formatting in Disk Utility in macOS

If the option to select the encrypted format type doesn't appear when using Disk Utility in macOS, you may need to change the partition scheme, e.g., change to GUID Partition Table:

1. Disk Utility > View > Show All Devices
2. Go to root of the target drive then select "Erase"
• Format: APFS (Encrypted)
• Scheme: GUID Partition Map
  

Note: Mac OS Extended (HFS+) is the previous file system from Apple, but APFS is currently recommended, unless there are compatibility issues with systems before macOS High Sierra, or if you want to use the drive with Time Machine on macOS Catalina or older.

References
Disk management command line: https://www.theinstructional.com/guides/disk-management-from-the-command-line-part-2
No partition scheme option: https://apple.stackexchange.com/questions/304131/no-partition-scheme-option-when-erasing-a-usb-disk-in-macos-high-sierra
Comparison of macOS file systems: https://www.techrepublic.com/article/apfs-vs-hfs-which-apple-filesystem-is-better/