Clicking browser action icon sometimes takes two attempts

[birtles]

As per [this review]:

I've noticed recently that when I click the icon, it doesn't turn on. I have to click it twice. Why is that? Is it a bug? A lot of times I thought it's enabled and I hover a word to find out it's not on and have to click it again, it's a hassle really.

This is likely fallout from switching to non-persistent background pages. It sounds bad.