how do I get to the 'options' settings if Firefox on a nexus android tab

You have Tools and Settings in the Firefox Android. To check that click menu/center button to view the list. To block popup menus, make use of this Addon *https://addons.mozilla.org/en-US/android/addon/adblock-plus/?src=hp-dl-mostpopular For more Addons for firefox Android *https://addons.mozilla.org/en-US/android/