I've installed Firefox on a Samsung Note 4 running a CM variant, Android 7.1.1. Whenever I drag my finger upwards on a webpage, the webpage goes black. It looks as though I am pulling a black overlay over the screen. I've uninstalled / reinstalled and the problem is still there. Webpages (well, the tops of them) look fine. I am NOT running a non-standard screen resolution. Any ideas? I'd be glad to provide a LogCat log if that might help. I'd also be glad to send a firefox log, if someone would point me to a how-to to get that. Thanks!