We are all aware that firefox can hog ram, right? I cured this in my macbook by disabling firefox helper. But I noticed on my imac I did not need to disable the helper and it runs fine. My imac has only 4GB ram but my macbook with 4GB ram kept crashing in firefox. Disabled helper and it is ok, but up ram to 6GB then 8GB and no more bugs. Is it normal for desktop to behave differently to notebook?