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When I middle click anywhere on a page other than a link, it'll take me to a page that I've already been at since opening Firefox, and keep doing it every time I middle-click something that isn't a link. I can't find a pattern as to what page it chooses, and it seems to me like it chooses pages at random intervals and stop after a random amount of time, or sometimes not at all.

Can someone please tell me what's going on, and how I can disable this behavior?

I'm running Firefox 21.0 on Linux Mint 14 with MATE.

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up vote 5 down vote accepted

It's "pasting" the contents of clipboard as the URL to open.

You can disable it by typing about:config into the location bar, searching for middlemouse.contentLoadURL, and setting it to false.

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