Firefox 4.0 uses 3x more RAM in average than 3.6.16 did!

Since upgrading to Firefox 4.0 from 3.6.16, I've noticed that '''the new version uses approximately 3 times more RAM as the previous version did''', comparing like with like (same browsing patterns etc.). This becomes extremely annoying when having several tabs open (50+). This seems as a serious memory leakage, and IMHO it ''should be instantly addressed by the developers, 'cause it deteriorates the browsing experience massively''.
A laymans hint: it seems like the browser is refreshing tabs which are in the background, even those which are in a minimised 'tab group' - my suggestion (providing this previous assumption is valid) is to allow for the users to set a parameter for each 'tab group' as being offline 'tab groups', i.e. not continuously refreshed by the browser (I personally, when I organise web pages in tab groups and send them in the background, rarely (if at all ) want them to be refreshed. ''This hint was just a guess, disregard it if proves to be false''
OS: Vista Business SP2

Thank you, cor-el, for your reply. I clicked on the link you provided, and it took me to Create a New Article. I'm assuming an article already exists for this. Can you instruct me on how to view this article. This is the first time I have ever had to refer to Mozilla Help. I have tried to do this on my own, but am having difficulty. Thanks for your help.

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