Detailed look at the clever functionality in Google Chrome when closing tabs.

http://www.theinvisibl.com/news/2009/12/08/a-piece-with-a-lot-of-screenshots-about-the-close-tab-behaviour-in-google-chrome/

ANY BROWSER?
Oh dude, it sucks, "any browser" is different than "Safari".

True, very true! I suck – apologies. There's no way I've looked at every browser!

If after closing a tab, its close button is replaced by the close button of another tab, one risks accidentally closing the second tab.

There are two ways this can happen.
If double clicks are handled poorly, they may be treated as two single clicks. If the system is sluggish, one might reclick because there was no immediate response. The second click may be queued and delivered to the second tab.

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Mozilla used to have one close button in a fixed location, rather than one for each tab. It applied to the top (visible) tab.

I usually click the scroll wheel to close tabs anyway.