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Disable StumbleUpon Toolbar If It Is Not Being Used
Firefox is ofcourse one of the most used Internet browsers and is the biggest competitors of Internet Explorer but if not controlled properly then a layman could easily feel like kicking off firefox once it starts consuming lots of memory. The best way to prevent firefox from consuming extra RAM is to disable all the add-ons which are of no use for you (the hit and trial method works best here.)
Similarly one add-on which I think consumes extra RAM and slows down firefox is the StumblUpon add-on. Recently I disabled SU toolbar when it wasn’t in use ( press CTRL + F11 to disable SU toolbar) and firefox started responding much quicker.
So next time when you are not using the SU toolbar then prefer disabling it for that period, so that your browser won’t hang while you are busy paying money for something like cruise deals or some other stuffs.