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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Try to disable hardware acceleration in Firefox.
- Firefox > Preferences > Advanced > General > Browsing: "Use hardware acceleration when available"
[edited to fix incorrect Tools > Options menu link]
Thank you for trying to solve this problem for me but this doesn't fix it. (btw in 18.0 for Mac OS the hardware acceleration option is in Preferences>Advances)
You can try out the Firefox 19 beta to see if that still has this problem.