@XaunLoc Unless something is really wrong in your installation, the "ad" opens in a separate tab, in both Firefox and Opera. So if you switched into Opera by clicking a link outside of Opera, your chosen page is still loading in its own tab. You're not losing any time except the trivial time it takes to close the superfluous tab. (Command-W and/or Alt-F4 ought to be second nature.)
I'm not saying you're wrong to bring this up as a minor annoyance, but it seems like an awfully trivial hill to choose to die on.
(For the record, I like to know when an app has updated behind my back. It gives me suspect #1 if anything doesn't work the way it used to.)