I use an external password manager for anything important. It's less convenient and requires extra steps, but the database format is well supported on multiple platforms, and there's redundancy if one of the programs ceases to exist. I don't quite trust firefox's newer lockwise password manager, with the autogenerated passwords. I don't fully understand how it works, and had a couple rocky episodes when I tried to use it. I prefer creating/generating a password, reviewing it, then explicitly storing it with no "magic" going on in the background.