Operating System full name? version? build? Windows 10 version 1903 build 18362.295
KTS, free or licensed? version? patch(x)? licensed, 20.0.14.1085 (c)
Kaspersky Protection extension version? 30.0.3762.27d-20190319165301
Can you detail more, the page up/page down button issue, or if it's possible to show in images, please post? if there is a possibility to scroll up/down (vertical scrollbar is moveable), page up/page down behavior is stuck. scroll bar behavior is normal. unfortunately in this case, a pic will not be useful.
Has the issue always existed or just begun? just begun. i just reinstalled my computer, reinstalled firefox, and reinstalled kts, so they were the only three apps when i catched the issue.
IF, the issue is recent, have the been any changes, hardware, software, network, anything at all? nothing changes. it was a clean windows reinstall. please replicate.