No antivirus spam for me but I did notice something weird using Firefox with uBlock Origin. On PC I also have NoScript and everything seems "fine" (no warnings from Windows Defender either) but on mobile where I also don't use NoScript each page loads normally and does everything "useful" but then gets stuck loading forever at around 75% completion per the progress bar. The only immediate consequence is that refreshing the page requires 2 taps instead of 1 but I haven't checked mobile data usage and the like yet.