page down doesn't respond at first, then goes when the pointer is touched
I have a problem where the page down button often doesn't work (seemingly at random), but as soon as I move the mouse, the screen immediately jumps down. If I've pressed page down twice, it will go down two screens, so it's like it's stuck waiting for something; but nothing is loading, it always goes at the instant the pointer moves. Just waiting doesn't do anything. There appear to have been some other issues with page down not working at all, but I haven't seen anyone else with this, and it's pretty irritating...
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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
- Don't make any changes on the Safe mode start window.
- https://support.mozilla.com/kb/Safe+Mode