Not completely, RW. Your OK with the Meltdown Intel issue, but the Spectre problem affects Intel, AMD, and ARM processors. Check to make sure your current anti-virus is watching for Spectre for AMD.
I use “paid for” avast.
Also, even though I was a VERY early adapter of FIrefox, I abandoned it about two years ago for the browser that comes with avast. Biggest advantage: When you are watching a video, it recognizes that fact and has a button on the address bar that allows you to make a permanent copy of it.