On Android 4.x the menu button is a stack of 3 vertical dots that should appear just to the right of the stack-of-tabs button. It's missing?

Yes, but only with CyanogenMod. When I flash my phone to the stock ROM and open FireFox they are there. Is there an Add-on I can download to force them to appear or something to that effect?

I'm not sure how Firefox detects the Android version, but perhaps CM has a way to present itself to Firefox as ICS or higher, or to report that there is no hardware menu button?

I was able to find the solution myself. but I appreciate your help. In CyanogenMod go to Settings -> Buttons -> and check "Show Action Overflow" (It even says right next to it "Display the 3-dot overflow menu button within apps")

Thanks again! :)

I have an HTC EVO 4G with DigitalKarma v8 on a rooted phone. I have the same problem with Firefox. The 3 dots show up on other apps and.or the Menu button works, but with Firefox there is no 3 dots and the Menu button goes to More > various tweak settings that don't include displaying the FF menu bar.

I'm not familiar with DigitalKarma, if it's similar to Cyanogen I would try digging around in the settings menu. Like I did, - see the post above yours....

I did and found nothing.