How do I start firefox in safe mode on a Mac as the equivalent of holding option key whilst starting doesn't open dialogue on Mac?

I am trying to reset toolbars and am following firefox's help instructions. How do I start firefox in safe mode on a Mac as the equivalent of holding option key whilst starting doesn't open a dialogue box on the Mac?

Thanks Morbus.. I hadn't noticed that but it was already set at Mac. I tried it again and it worked this time... but alas my main problem persists:
My back and forward buttons don't work in Firefox and I've lost all of my bookmarks! I've tried a few of the suggestions but without success at the moment.
Particularly unhelpful are the instructions to back-up your lost bookmarks - which I can't do cos they're lost!!

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