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This is what happens for a lot of "this is just as good!" type features in any domain.

Many advocates will tell you the thing is just as good, or at least more than good enough, and will deliberately avoid telling you about the many pitfalls and not-so-edge cases that they are very much aware of.

Unfortunately, feature detection indicates that Firefox on Android supports vibration, but it doesn't currently work.

https://bugzilla.mozilla.org/show_bug.cgi?id=1653318

Par for the course on Firefox I'm afraid. Every time I give it a chance it lets me down.

Same experience for me on Android Firefox. Couldn't return to HN via the back button, and most of the features were either "not supported" or just didn't work (e.g. Vibration)

Seems that either the author is only working in Chrome (which is probably reasonable for a prototype or whatever) or Firefox is lacking many of these features.

I thought it was just me because I'm using uBlock. But even with the site first party scripts and line allowed it didn't work.