Canvas is not working anymore asof yesterday 28 Aug 2019 - yes I have an older mac running 10.6.8, yes my browsers are old, but they will not update them anymore on my system. HOWEVER - whatever minor change you made has meant I now can't interact with my LMS anymore unless I buy a new laptop or go through the phone app, then transfer all my files manually to my computer or vice versa. That is NOT fair, and several other people on the Q and A page seem to be in the same boat. Why force us to contribute to e-waste when a day ago the system worked perfectly fine? Whatever you have done, UNDO IT!
I'm sorry that you're frustrated. There are some things you can do, though.
Here are some troubleshooting steps you can try: