This extension uses very slow animations to open the focus-exclusive overlay of its interface. If you don't interact with it directly, it dismisses itself.

Both of those issues are egregious UX failures that need to be addressed. The animation is unnecessary and makes your extension look poorly made; which it is. The fact that the overlay doesn't remain open is even more absurd. I keep my account info in a vault, so I am forced to manually type my email after pasting my password because if I were to leave the form it would just evaporate, clearing the form as well--and to make it worse, it would show the slothful opening animation again.

Partially UX, partially just terrible programming, is that the extension requires you to sign in repeatedly even within the same browsing session, which means it doesn't have good error recovery, connectivity state detection, sleep detection, etc. It would be reasonable to expect that once you sign in with your account, you never have to log in again unless a significant passage of time between uses is detected, like 3 months or more, or your subscription lapses.

None of these issues are difficult to solve. The first two could be solved in two lines of code, I'd bet. The sign in issue seems to happen to far too many people to be an isolated issue.

Perhaps you should consider that not everyone uses their browsers the same way you do. I leave Firefox open for maybe a month at a time, literally until Windows forces me to reboot for updates.

I put my machine to sleep at night and don't manually disconnect from a server in the add-on. That doesn't mean I should be signed out. That just means the add-on should reconnect the next time it "ticks" when the machine wakes up, or when there's network activity in Firefox.