I use SafeZone several times a week … works fine for me.
How can SafeZone which uses Chrome as its basis , affect Firefox?
if I knew that, I could probably fix it 
no seriously though I think you misunderstand, it’s after I RETURN to normal desktop after using safezone that any instance of FF or TB is then drawn so that the menus are off the screen - looks like a resolution issue to me - I guess I need someone else using FF/TB and safezone to corroborate
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Give details of your system, OS, avast version.
OS - windows 7 64-bit Home Premium
AVAST - 2014.9.0.2011
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Have you tired preventing " Trusteer " loading serrvices, and then testing SafeZone? ( Personally, I wouldn’t have that Trusteer crap on any PC of mine.)
I have already COMPLETELY removed Trusteer from my system