Why firefox 3.6 downloads all of the files again after restartarting the browser from a website if the "clear history when Firefox closed" is not Enabled?

We have a corporate website, we officially support FF3, FF4, IE8 and IE9. Our web site is quite big, so we really need browser caching, first time page load is around 15 seconds. With files in the cache getting new page is less than a second.
Everything works perfect except with FF3. With FF4, IE8, IE9 if we are on the website, clicking everywhere is fast, the page is in the cache. If we restart the browser, it is still fast, it loads files from the cache.
But with FF3 we have a problem. Every time we restart the browser, it is loading the files again from the server, instead of using the local cache (checked with Firebug). I can reproduce the problem anytime, it is the same with every FF3 instances. I double checked, the "clear history when Firefox closed" option is not enabled.
Could you advise please how to use the local cache either after browser restart?
Thank you!
Chris

Just read that the default memory storage on FF is set to 5 mbs. You can up that by clicking on tools, advanced and overriding the default and set it to 50 mbs (if you use lots of tabs) or 10 mbs (if you use just a few).
I open a blank tab and clear the cache periodically, while I am working. I can have several tabs open and watch videos on Youtube, by doing this. Have you cleared your cache?
Since I have an older computer, I've also used CCleaner for years. I use it often, but always before signing off. You can get it free...search for CCleaner, download from Pirifoam free. I didn't change any of the settings and it clears crap left behind from uninstalling programs, clears all browsers at once of: cookies, history, passwords, etc. I love it!
I had freezing, before using the "open blank tab, clear the cache" thing. Now I have no problems. Plus, as I said...you can change the default memory usage for FF and that should help too.
Hope this helps! Good luck! :)

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Why firefox 3.6 downloads all of the files again after restartarting the browser from a website if the "clear history when Firefox closed" is not Enabled?

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