Topic: Make it so: Block Yahoo pop-up "Yahoo Chrome Extension" box

This drives me crazy.  Every time I long onto yahoo mail or refresh yahoo mail that annoying blue box pops up asking me to install the Yahoo extension for chrome. Please find a work-a-round or fix for this unending annoyance.  BTW:  I even succumbed to the add and tried to load the extension....but nothing happened.  That box haunts me constantly.  Please make it go away or find a way for me to absorb it.