Type the following into your address bar in Firefox:
about:config
You will see a window that looks similar to this:
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You will want to right click anywhere in the window, choose New, Boolean, and enter in the following text:
config.trim_on_minimize
To change the value you can either doubleclick, or right-click and choose Toggle. You will have to restart Firefox, but after you do, you should notice the memory usage go way down whenever you have Firefox minimized.
Update: You will want the value to be set to True in order for this to work.
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