Probably not the best place to ping for technical support, but, since you claim to be the author, and I don't see any "Issues" on your GH...

Any idea why your script does not seem to flag as a valid greasemonkey script when I try to use it in the Falkon (KDE) browser? Even if I attempt to add it manually, the script then disappears from my gm scripts.

> I don't see any "Issues" on your GH...

Issues and PRs are available to open.(I just have not gotten any yet.)

> Any idea why your script does not seem to flag as a valid greasemonkey script when I try to use it in the Falkon (KDE) browser?

Honestly, no idea. I have only tested it with Tampermonkey on Firefox. Manually installing it should still work.