Firefox opens twice in background then freezes

When I am running Firefox 4.0, it munches about 250 mb of memory. Nevertheless it runs for about 20 minutes then suddenly will not open any more web sites. When I open my Task Manager '''I can see that firefox.exe 32 has opened a second very small instance of itself'''. If I close this instance, Firefox shuts down and works just fine when I re-open it.
What is causing this? It is very annoying.
P.S., I have also noticed that if I run Firefox of a RamDisk this does not occur.

Firefox opening twice was driving me nuts till I found the answer
I have firefox in my quick launch so when I double click as usual it opens twice..but if I single click it opens once...I even tried click 3 times and yup three firefoxes opened up..I also have firefox on my desktop..double click from there and it opens once...hope this works for you

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