I suggest you continue any discussion in https://support.mozilla.org/en-US/questions/1297620 This is a continuation of that discussion and I am closing the topic. As the bugs I already linked you to discuss this going back to at prior to version 3. You would want version 2. It does not support modern authentication or connection security so would be unable to collect mail from most mail servers. So how about you consider working around the minor inconvenience. Perhaps not running filters when you have tabs open might be a start.