Last night, Firefox spontaneously stopped recognizing input from my Logitech M650 L mouse's side buttons used to go back and forward through the browsing history of the current tab. I've tried refreshing firefox, checking the mouse software, trying a different profile, trying firefox in safe mode, checked the firefox config and the mouse button inputs were set to "true", tried clearing the cache, and even tested on a website that shows you your mouse inputs and the side buttons were not detected at all, while all other buttons were detected fine. The side buttons work fine in all other programs and browsers on my PC: Windows 10 64 bit.

There was a brief period where they started working again last night, but seemed to stop upon reboot my computer.