I keep three browser windows open at the same (usually Chrome, Vivaldi, and Firefox) when I'm grading for my online classes. I get confused sometimes as to which page is active. Is there an extension that would indicate that a page is the active one at the moment? Is there some other way to know which page is active at the moment besides clicking on the page? Not a big deal, but I'll hit return, for example, which will take me to a different part of a page -- only that wasn't the page that I thought it was, etc. I have different colors for each of the browser windows - so that isn't the issue - it's just that sometimes I forget which page is active at the moment. Ideally, what I can see in my head is that only the active page is bright and the others are shaded. I know -- first world problem. Thanks.