If its a frequent problem you could set them in the optional user.js file. Those are the only two sets of settings that you need to worry about being reset due to the default value changing for a different version. If you try a really old version its possible you might have the same problems with the settings (mainly and ) to enable graphics acceleration.
You will need to set it false again when you run the current version of Thunderbird. If you set extensions.strictCompatibility false using the config editor to let you install add-ons that don't explicitly state they support version 60 or later that value may get reset to its default value (true). Its also possible to keep the current version, and do a custom installation of a older version in a different directory to see if your problem is due to the latest version of Thunderbird or not. Whatever version of Thunderbird you re-install, it will automatically find and reuse your profile (it contains your mail, address books, settings, saved passwords, add-ons etc.), which is not deleted when you uninstall or reinstall Thunderbird.
This article describes how to go back to an old version of Thunderbird, including how to deal with problems that may occur due to changes to your profile.
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