I take it there is a business idea in there for Genius to pursue this. Extensions that stick ads on other people's web sites are one of the most common form of malware. That's a line they can not (but will be tempted to) cross.
What makes business sense for them narrows what they can do more than what is legal. This idea sounds conspicuously like something that's been tried over and over again and they will need the support of authors to make their outcome any different from those before.
What makes business sense for them narrows what they can do more than what is legal. This idea sounds conspicuously like something that's been tried over and over again and they will need the support of authors to make their outcome any different from those before.