Leaving tab before fully load

[jessiclin]

If you open a new tab and leave before it fully loads, the tab will not be kept track of. As a result, no screenshots or comparisons are made at all
For example:

1. Go to youtube.com and immediately enter a new tab
2. Go back to youtube.com, scroll down, and leave the tab
3. Go back to youtube.com. A notification should pop up, but it doesn't

[pchan37]

At the moment, one of the basic assumptions is that the tab has finished loading before the person has navigated out. The focus of this extension is only to tackle the scenarios where the tab's content is changed onBlur (as I understand it) and the blur handler won't trigger if the user navigates out before the page fully loads (i believe).

[pchan37]

I'm keeping this open to track this issue if we ever decide to expand beyond our initial focus.