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A middle-click on a tab will close a tab on Firefox except for the last tab. I know that there is some setting somewhere that allows this because I have one PC set up long ago which does this, and one PC which I set up recently which doesn't.

Closing the last tab causes it to turn into a blank page.

Does anyone know how to switch this setting on?

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up vote 4 down vote accepted

See this article : "Closing the last tab in Firefox 3.5" for how to manually do this.
The article also recommends this add-on : Last Tab Close Button, which quote "shows Close button on the last tab in Firefox 3.5*, which closes the last tab but not the browser".

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thanks :) much appreciated – izb Sep 7 '09 at 8:51
Thanks. I was unaware of that about:config thing. Is there any explanation of all the settings found there? – Mudassir May 5 '11 at 10:01
See About:config - MozillaZine Knowledge Base. – harrymc May 5 '11 at 10:06

Try using TabMixPlus. Among other things, it can set this behavior to what you want. It also has a lot o other nice features that you might like.

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try setting in about:config

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