Mac on High Sierra want me to update browser
Hi I've just installed a new modem wifi, mac has recognised it but not wireless mouse so back on wired mouse but I need some advice on how to find a browser in non-tech language please. I tried to download firefox but I can't tell if it worked its not in the browser choice box in General all that's there is safari with no other options.
I'm not that tech savvy!
iMac 21.5″, macOS 10.13