Ernie, Thanks for writing! I've not fiddled with this myself, but Apple has a short tech note on it: https://support.apple.com/en-us/HT202828 "Change the font size on your iPhone, iPad, and iPod touch
There is no connection to firewall or adblocks. You can surely use one, but the behavior you described goes beyond typical web ads annoyance. Adblock: Try Ublock Origin (Download from Chrome store)
Hi Yolande This is strange. Do you have many files you need on your iMac? Did you backup?
Cameron, Thanks for writing! Apple has this to say about Gatekeeper: https://support.apple.com/en-us/HT202491 "Gatekeeper helps protect your Mac from apps that could adversely affect it. Some
Cameron, Thanks for writing! Assuming you are talking about Apple's latest wireless keyboard, it should be a small switch on the back as per the second paragraph in this article: http://www.macworld