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Eclipse IDE does the same thing, putting little colored ticks in scrollbars to indicate things like:

* locations of last term searched

* other references to same variable currently highlighted

* TODO comments

Not quite in the scrollbar. But beside it.

I think chrome is marginally better (har har) because it saves like 10 horizontal pixels.

One of my computers is a tiny netbook, and let me tell you, saving 10 pixels is what I worry about all day long.

I think they call it "the gutter".