This has mostly affected me on my work PC. I just tried installing it to find out IT blocks adding new extensions now. :(
I’ll just have to be extra careful not to reflexively close Firefox if my tabs don’t show up, and make sure to make a backup of the old session file before restarting.
Sleep is in seconds for Linux/UNIX, but milliseconds on Windows. 50,000 ms is 50 seconds.
https://www.geeksforgeeks.org/cpp/sleep-function-in-cpp/