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" mirror tab" does not appear on menu in Android beta version, as described in help topic on mirroring a webpage on tv via Chromecast..
Downloaded Firefox Beta for Android because I read about its support for Chromecast. I'm running Android ver. 4.2.1 on an ASUS TF700t tablet. I get that the Firefox menu is hidden because my tablet has a 3-dot menu, which I can access via Tools on the device menu. But Mirror Tab does not appear on the Tools menu.