Firefox 18 does not work on Win 7 machine

I've recently installed Firefox 18 on my Win 7 machine. It does not work properly. It takes a very long time to start, and when it has started it sticks when I move or click the mouse within most web pages.I can search with google and go to pages selected from the data presented. But once I get onto a page, almost any mouse action locks it up.

(I am in the UK. An example of failure is if I call up John Lewis with Google, and select the Electricals entry in Then trying to select anything on that page locks up)

I've gone back to Firefox 5.0, which is the most recent previous version I can find. That seems to work perfectly.

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