How to Turn Off “Add to Circles” in Gmail
Since Google introduced the feature to add circles in Gmail, we’ve all tried accidentally mousing over someone’s name, and then having a list of people appear on top of our current view of the email interface, with their names and emails on top. This list gets quite long, so if you happen to mouse over one of the Circles, it may be a little confusing as to what you’ve just done. To avoid this, you can stop the circles from appearing in Gmail.
To turn off the circles in Gmail, you just need to install this extension so that the “Add to Circles” button doesn't show up anymore. It's as easy as that.