Opera keeps reloading tabs.
I'll give you until February 28 to restore Opera to the way it used to be and if not, it's uninstall and delete.
I take classes online and cannot have pages reloading every time I switch tabs because it locks me out of quizzes and tests and when doing homework when the page reloads it's counted as an attempt so if I have only two attempts to complete an assignment I just lost one attempt when the page reloads.
Opera is also useless for forums, because if you have to research something and come back to the tab it reloads and you lose everything you've typed.
Firefox doesn't do that.