or randos on the internet then?
I mean isn't that practically everyone on the Internet that you don't know personally? Or do you actually know the Firefox and/or Librewolf team, and audit their code as well?
If no to both...sounds like you are putting some measure of trust into "randos on the Internet." Which is not abnormal. Trust is required at some point in most processes.
I'm sometimes super slow at the start of self checkout. If the bags are stuck together, not open, and if I didn't bring my own, sometimes it takes me 2 minutes just to open a plastic bag. I'm trying my hardest!