Websites i have not visited appear on my history. How do i detect someone else jumping on my wireless?

I have found websites i have not visited appear on my browsing history.
At first they look like pop-ups (because they're for online poker and porn) but actually they are visited websites.
I'm using Firefox on my iMac with a password-enabled wireless connection. Since turning on my firewall the problem's gone away but that's causing havoc with my bluetooth stuff.
Apple told me that because I route my PS3's internet through my mac, all bets are off - but i want to find the clown(s) who's been jumping on my wireless for free. My ISP is useless - the only advice they can give is that i change my password...
Anyone got any ideas? any downloadable progs which could recognise computers trying to join my network?
All help would be very appreciated...

1. By default in WinXP installations of Firefox, the Menu Bar is showing with the Bookmarks word menu-item - the Bookmarks '''button''' appears when the user hides the Menu bar by clicking on View > Toolbars, then clicking on the Menu Bar menu-item to remove the check-mark.
2. https://support.mozilla.org/en-US/kb/import-bookmarks-data-another-browser

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