I say this as a LastPass user, they clearly don't give a rat's ass. They've known about the WebExtension requirement for, what, a year now? Somehow they're among the first apps to support Android Oreo's autofill API, yet they can't be bothered to update their Firefox extension.
It's a real pity. I like LastPass. I pay for it. I use their Secure Notes feature ALOT. But I may still have to switch if they can't get their act together.
(The LastPass firefox app also seemed to use a lot of CPU for some reason, I have no idea how that was possible?)
Note: It doesn't support all of LastPass features, like per-website extra data, which may be a problem for some users. There's also no Safari plugin.
Or do you mean something like 'you must re-enter your master password for particular sites'?