This is (tragically) the reason why I remain a tab hoarder: the UI carries an implicit nudge (a costly signal of visual real estate), for my future self to engage with it.

In a similar spirit to OP: it did help mitigate the hoarding, when I began thinking "how hard is it to find this resource/reference again, should I actually need it?". And if it's trivial to google (and mnemonically sticky enough I can trust my future self to remember it), I can close the tab.