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Massive memory Usage when browser is not shut down. Why? How to stop it?

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Massive memory Usage when browser is not shut down. I keep my computer on at work and read email and work out ofthe browser. Every version of Firefox keeps eating memory and is sluggish. Currently Firefox is using 1.5 gigs of RAM! What is going on guys? Yes I can restart and load. But typically I will have several windows open and will have to sometimes re-login. Its unacceptable! 1.5 gigs of RAM for 8 browser windows (all with barely more than 1 tab open??????) I'm finally going to chrome.

Massive memory Usage when browser is not shut down. I keep my computer on at work and read email and work out ofthe browser. Every version of Firefox keeps eating memory and is sluggish. Currently Firefox is using 1.5 gigs of RAM! What is going on guys? Yes I can restart and load. But typically I will have several windows open and will have to sometimes re-login. Its unacceptable! 1.5 gigs of RAM for 8 browser windows (all with barely more than 1 tab open??????) I'm finally going to chrome.

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Well, I'm not going to chrome yet, but there should be a setting to stop whatever is eating the memory. I cant believe that its bad coding for all these versions.