A big thing for me is that Tampermonkey is not open source.
And yes, Firefox on Android has an allowlist of "known working good" extensions, the reason given being that Firefox for Android doesn't implement everything the Desktop version implements and IIUC, want to a avoid users blaming the browser when something breaks because of it.
And yes, Firefox on Android has an allowlist of "known working good" extensions, the reason given being that Firefox for Android doesn't implement everything the Desktop version implements and IIUC, want to a avoid users blaming the browser when something breaks because of it.