Change the behavior of the release notes system
Created by: najjara
Since this is a restartless addon, it'll update on the fly while browsing.
But unlike traditional addons, making the release notes appear after updating can be problematic. In a traditional addon, if a page is forced to load (such as a changelog) it's not a problem, because the browser is empty and the user isn't yet engaged in browsing.
But it's distracting to have the tab that I was on suddenly be switched to a new one unannounced. I still want to see the notes (so I don't want to disable them), but maybe the loaded tab shouldn't be focused immediately. Or maybe give a floating window that says it has been updated.