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See the Set Adobe Flash to "click to play" on Firefox article for details. To prevent automatic loading of unwanted Flash content, use the "Ask to Activate" setting in the Add-ons Manager Plugins panel. Many web pages have content you don't really need that uses memory to display.
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Extensions and themes Disabling memory consuming extensions and themesĮxtensions and themes can cause Firefox to use more memory than it normally would. The latest Firefox version includes improvements about memory usage.
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