As an ex LastPass user I am more than satisfied with Bitwarden. Although the free version works just fine for me, I pay the small yearly fee anyway because I want to support what is reported to be one of the best, if not the best password managers out there.
As a Linux user I am pleased to report that it works well for me and apparently all the OS's.
I have this on all my computers, laptops and PCs, tablets, and cell phones.
It's a lifesaver!

An outstanding cross-platform password manager with a huge variety of features, all for free! The autofill works like a charm on Firefox.