Hi Mspahumphrey You can't sync videos or mirror tabs from Firefox to your Roku in the current release which is Firefox for Android 37.0.1 We are working on mirroring tabs from Firefox to Roku in a future software release but I don't have a date for this release. You can hover send video URLs from FF for Android to Roku, here's how: https://support.mozilla.org/kb/use-firefox-android-send-videos-your-roku Cheers! ...Roland p.s. if the above doesn't help since we can't read minds :-) we need more troubleshooting details to help you: # What model of Android tablet or phone are you using? What version of Android are you using (e.g. Jellybean 4.1-4.3, Kitkat 4.4, Lollipop 5.0, 5.1, etc)? # What version of Firefox for Android are you using? (please try the latest version which is currently FF37.0.1) # What did you do exactly, what happened and what did you expect? (details please! i.e. what do you mean by "sync firefox Browser to my roku streaming player " and what steps did you try?)