When 100+ tabs are opened and suspended in firefox, uses several GB of of RAM for some reason. about:memory shows millions of allocations of some image:
top(moz-extension://16363139-6470-463a-a1ce-52903bd0a5e1/_generated_background_page.html, id=153)
"data:image/x-icon;base64,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"