On my 2017 iMac, OS 10.15.x, I'm running an app-blocking firewall, called HandsOff! by OnePeriodic, which is great at controlling which system processes can connect and report to the web. Firefox (v.83.0) runs fine until a few specific system daemons make contact with my computer, after which no page will load. The daemons in question are remindd, mediasharingd, touristd, and amsaccountsd. Normally HandsOff! sets my preferences for each process, to refer to when those processes attempt another connection. However, these four daemons' prefs do not remain in the settings, yet FFox still refuses to load. Not sure if all daemons are to blame, or only 1 or 2, but they seem related. Other browsers do not work either, but Tor Browser works fine! (which i'm using to send this msg.) My only remedy is to un-install and re-install HandsOff!. Then FFox and others work great until those daemons show up again. I realize this is partially a HandsOff! issue, but i wish i could start a group email between developers at Mozilla, Tor, and One Periodic, to compare why Tor is the only browser to get through, and to overcome this block. Thanks!