Clicking links in emails leads to spam windows in browser

Hi all

Last day or so, if I click a link in an email, then instead of opening a new 
tab in the running instance of Firefox, it opens a Firefox window, loads the 
destination URL in first tab, then tries to fill 3 more tabs with adverts.

This does not happen if I copy the URL and paste it in the location bar in 
Firefox.

Which implies it is something happening BEFORE it gets to Firefox.... either 
in Kmail or somewhere between the two.

Has anyone else experienced this?

Hope my system has not been compromised somehow ...

Thanks, Ian

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