Is a Mid 2011 iMac considered obsolete?
It seems my iMac w/High Sierra 10.13.6 (can't be updated?) mid 2011, has lost ability to use some functions of some websites. Is there any way to correct this? I do have a linux os on thumb drive (unused) but it's kinda old now too. The capacities had been upgraded to the max when I bought this refurbished about summer 2020.
[Re-Titled by Moderator]