Tampermonkey is pretty good, it's my preferred userscript extension. My only problem with it is that it doesn't work with Firefox containers. Specifically, trying to export the settings to Google/OneDrive/etc. won't work if those sites are set to open in a container; when it opens auth.tampermonkey.net/auth to use OAuth to log into those services, the pages open in the specified Firefox container and Tampermonkey immediately throws an error. I've tried opening TM in the same container, I've tried setting auth.tampermonkey.net/auth to always open in the container, etc. but nothing works. The only option is to export to a ZIP file and carry that file to the destination system. 😕