1 Answer

If this is associated with Norton, my best suggestion is to remove Norton as it's a money eating energy wh**** and get a free antivirus like AVG free. 

Here's one answer from the internet.

"Because Norton is wrong. It gives you a warning for something it thinks is high, but it isn't. In fact, the more RAM a well-coded program uses, the better, in many cases. This lessens the amount of disk reads/writes the program has to do, which increases performance. RAM is meant to be used.

The first thing I do is turn off the "Performance" function. I've only seen it give warnings when things are just fine. In many cases, you want a high CPU or memory usage, say when you're playing a game - then you want it to use all the resources it can, or performance will take a hit. What you don't want it a program interfering in normal operations to complain about "high" system resources, when either 1) they aren't high in the first place or 2) high system resource usage is actually beneficial.

The RAM usage you describe for Firefox is perfectly normal, maybe even low if you have a lot of windows or tabs open for a long time."