I created a [minimal page using jquery.nicescroll 3.4.0 here](https://theres-waldo.github.io/mozilla-testcases/bug1842690-old.html), and the issue reproduces there. I then made a [modified version](https://theres-waldo.github.io/mozilla-testcases/bug1842690-new.html) of the page which uses the latest version of jquery.nicescroll, 3.7.6, and the issue no longer occurs there. This version makes the page overflow:hidden in both Firefox and Chrome, but now the event listener is active and calls `preventDefault()`, so the InputResult is HandledByContent. Given that, I'm leaning towards the resolution that we should reach out to the site author and encourage them to upgrade to a version of jquery.nicescroll that's newer than the 10-year-old version they're currently using which does not work well in Firefox for Android.
Bug 1842690 Comment 5 Edit History
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I created a [minimal page using jquery.nicescroll 3.4.0](https://theres-waldo.github.io/mozilla-testcases/bug1842690-old.html), and the issue reproduces there. I then made a [modified version](https://theres-waldo.github.io/mozilla-testcases/bug1842690-new.html) of the page which uses the latest version of jquery.nicescroll, 3.7.6, and the issue no longer occurs there. This version makes the page overflow:hidden in both Firefox and Chrome, but now the event listener is active and calls `preventDefault()`, so the InputResult is HandledByContent. Given that, I'm leaning towards the resolution that we should reach out to the site author and encourage them to upgrade to a version of jquery.nicescroll that's newer than the 10-year-old version they're currently using which does not work well in Firefox for Android.