If you have an Android phone, there is a topic that talks about getting scripts going on the firefox android browser.
There is also a popular WK app for Android, that natively incorporates some popular user script features:
If you run iOS, I’m afraid I never paid close enough attention when it comes to extensions and options for that. But I’m sure someone else can chime in if that’s the case.
But I’m sure someone else can chime in if that’s the case.