This has started happening in the last week or two and it's driving me crazy.
Using Firefox on Windows (88.0.1 x64) and the LastPass plugin (4.71.0.2) when I login to my LP, after exactly 15 minutes the icon turns yellow and if clicked gives me a "It looks like your LastPass session has expired" message. It doesn't matter if I just used it to login to a website 10 seconds before, it will turn yellow at 15 minutes from signing in.
In the Extension Preferences I have "Log out when all browsers are closed" turned on, but "Log out after this many minutes of inactivity" is NOT enabled. I have disabled and enabled the plugin. I've removed it and re-installed it. I've re-saved the prefs. Nothing changes.
Now, the curious part is that on my machine at work, running the exact same version of Firefox and the LastPass plugin, it does NOT do this. It stays logged in for as long as I have my browser running (I'm at almost 30 minutes as I type this.)
What is going on?