Some browsers have that "resubmit form" thing and some don't seem to. I access Mudcat 'mostly' on PaleMoon, (a fork of Firefox) which does sometimes do it, but not always. It was a nuisance, but not a serious issue. I finally signed in on Vivaldi, a Chrome-type browser, but with a better GUI than the standard CHROME.. and haven't seen the notice.

   As to sites with good technical info, Arstechnica is very good.