excessive RAM memory usage

I am now using Firefox 18 and notice excessive RAM usage. It is currently running about 400,000k when it should be around 150.

I have tried suggestions like disabling plugins etc, I have installed RAMback, and have made changes suggested to things within the about:config function. When I look at Task Manager in Windows 7, the RAM figure for Firefox seems to be increasing as I look at it, without me even adding / opening tabs etc.

So, what can I do now (I really don't want to use IEĀ !!)

Any suggestions appreciated

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