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In my bookmarks, I have things that, in general, I don't need – only in specific life situations, rarely. For example: a bread recipe.
And in my tabs, I have things that, in general, I need because I wanted to look at them, but I'm just too lazy. For example: an art gallery. Or something that was needed and was open at the time, but then I forgot about it, and it's still there. For example: some battle map from an expansion.
The psychological difference is very significant!