about:addons-memory for Firefox provides an experimental about: page for advanced users to display memory usage statistics about their add-ons.

about:addons-memory for Firefox provides an experimental about: page for advanced users to display memory usage statistics about their add-ons.To use this addon, simply open about:addons-memory in a new tab and hit enter - a listing of all your Firefox addons will be shown along with the corresponding RAM usage.

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