If you run a Custom Clean then does it show LibreWolf as ‘Skipped’?
Similar to how Firefox is being Skipped here:
Does it show LibreWolf at all?
Edit - Having had a look round it seems that LibreWolf is not included as standard in CCleaner.
However it is included in the user maintained winapp2, so I’m not sure why that didn’t work for you when you got it from github. (Maybe you stripped out more than you meant to do?)
I suggest that you may be best asking for help on the dedicated winapp2 support thread that we have here: