I used to buy a lot on ebay.com, however they began to transition to a new page layout a few years ago, which made it too difficult to screen against scam-sellers(scamming was always a bit of an issue there). I briefly switched to walmart.com, however their site started giving a stupid error page for anything but the latest version of google chrome; this started about 2 years ago now.
anyway, here's a quick test i did(in firefox-esr) of a few sites which came to mind:
ebay: still has the dumb new design; certain js features appear broken(can't read customer reviews).
walmart: still get the "technical issues" error page.
newegg: main-page still loads mangled.
zoro: is it working again!? seems functional today... surprise!(i'll have to look into this more later; i did not test checkout)
thriftbooks: the search bar does not work.
so there it is. a bunch of sites i just simply can't shop on anymore. i'm surprised by zoro. will it work when i go to checkout?