Mouse desyncing on certain websites like YouTube, selecting things higher up the page.
There is no problem when scrolled to the top of the page, but when scrolling down it will desync and the selection of the mouse will be higher up the page but my cursor is down where I have scrolled to, obviously. Clicking will often click higher on the page, often not even on the current screen. This seems to really only be a problem when watching YouTube videos, the page where the video plays is the only page I see this issue. Anyone seen this?
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No. uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files and C:\Program Files(x86) Then restart system. Then run Windows Disk Cleanup. Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do : https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
Reinstall with Current Release Firefox 57.0.2 with a Full Version Installer https://www.mozilla.org/firefox/all/
Please let us know if this solved your issue or if need further assistance.