Few month ago Firefox become extremely slow on one of my PC Windows 10 (Chrome etc works perfect). I have few PC, different operating system and everything is OK with Firefox except one pc. I followed all fix/improve suggestions, nothing is help. After complete uninstall and new installation of browser (deleting all Firefox folders etc) the browser start working proper (reinstall of browser didn't help, i have complete uninstall it), but after few days the slow issues have back :( Is there some report/log diagnostic file that I can run and send you guys, these problem make me crazy :(