I have been gaming since 1992 and building PCs since 2003. I enjoy Linux, supporting FOSS projects and am a tinfoil hat connoisseur.
I use KeePassXC which doesn’t charge a cent for this.
I don’t know if Firefox’s is safe but I use and love KeePassXC:
I could say I know because i’m an elite haxxor but it would be a lie. I’m not even at script kiddie level.