FF18.0 Mac OS. right click (control click) on left half of an additional display brings the menu up in small font on the laptop

Upgraded to FF18.0 from the prior version (Mac OS 10.8.2) and it works great on my MacBook Pro Retina display. However, if either a 27" Thunderbolt Display or 27" LED Cinema Display is also plugged in and the browser is on the separate display there is a problem:

Right or control clicking the browser window anywhere on the left half of the separate display brings the pop up menu on the laptop in very small font (presumably at the higher resolution of the separate monitor). The problem also occurs with links on web pages that have preview pop ups when you hold the cursor over the link.

These were not issues in the FF17.x version I was previously using.

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