The web browser is a handy thing to have your monitoring tools in because it is open a lot of the time, and so then the information is always there and in your face. One of the monitoring tools that has caught my eye the most these days is StatusbarEx. It will show you a little ‘bit of everything.

It shows tons of useful information right inside of your Firefox status bar. You can find out the memory [...]

Firefox uses a lot of RAM. It is the number one complaint about this otherwise awesome web browser. So what can you do to solve this issue? Well there are a few rumored fixed out there in the wild.
Here is the nitty-gritty about:config solution to the problem:

Open up about:config by typing it into your Firefox address bar.
Right-click, go to new and then integer and name it this: browser.cache.memory.capacity
For the integer value, enter in 15000 [...]

It might seem like more trouble than it is worth, but this tutorial will show you how to get Mozilla Firefox installed and running in your RAM rather than from your hard drive. After reading through the step by step process, it seems simple enough. I guess I’m not sure how much of an advantage you are really going to see though.
+ Learn to speed up Firefox by installing and running it in your RAM!