If we keep the "AB Hide Selector" setting then we probably want to add some validation to it, since the content of it is put directly into the head. We can add some JS validation that tries to execute it as a selector. Or we could restrict it to a simpler regex, since it's mostly just needed for a class name.

It would also be nice to provide an end date setting that can correspond to the last day we run the test, so that this doesn't need to be disabled manually each time when tests are done.

Could be we can just close this ticket if it turns out we don't experience flickering anymore if optimize.js is significantly better.