Issues with my mouse acting like I multi-tapped the buttons

This suddenly started yesterday. I reversed the buttons, thinking something was wrong with the mouse, but it still does it. Especially annoying when I’m reading email. I click delete on one I finished reading and several emails after it suddenly disappear (they open long enough sometimes I can make out the title then they are gone)

Also, Firefox retrograded itself about a week ago and I can’t seem to get a newer version to open (I’m a newbie to Linux still) Any help appreciated!

Assuming you mean a real mouse and not a touchpad, many clicks instead of one are usually caused by the button microswitch becoming defective. Most mouses fail that way, and the solution is to replace them.