Knowing that AMD processors are set to just keep pushing power into them until they are just below their thermal limit is why I set the minimum and maximum power usage for it to 99% instead of 100. It might be okay for the CPU to run ~95c all the time; I don't know if the same is true for the motherboard it is slotted into. I'd rather just not see it go higher than 85c.

Not the greatest guide. 2 and 3 shouldn't be causing overheating unless you are running a potato. I don't know the impact of 4, but I can't imagine that its much on modern PCs. 1 and 5 are the only real advice. Blocked vents and dust are the other two good points, everything else seems questionable. Tab overload isn't a problem anymore, both Chrome and Firefox manage and deactivate tabs you haven't recently used.

Laptops get a pass on overheating under load since they need to be compact, but your desktop should not be overheating even at full load. If it is, the only real solution is to upgrade its cooling system.