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"Open Frame in New Tab" (or Window) disabled/greyed out

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I am trying to open an embedded video player in a new tab so that it fills the entire window. Unfortunately, the "Open Frame in New Tab" and "Open Frame in New Window" buttons are greyed out for no discernible reason whatsoever! I can still open it by finding the embedded player's URL through the "View Frame Info" button, but why is Firefox putting me through this trouble?

I am trying to open an embedded video player in a new tab so that it fills the entire window. Unfortunately, the "Open Frame in New Tab" and "Open Frame in New Window" buttons are greyed out for no discernible reason whatsoever! I can still open it by finding the embedded player's URL through the "View Frame Info" button, but why is Firefox putting me through this trouble?

Alla svar (2)

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Is this page opened via a JavaScript call ()window.open()) that is redirected to a tab?

Can you post a link to a publicly accessible page (i.e. no authentication or signing on required)?

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In a simply miraculous coincidence, it appears the the page I was having trouble on changed their video player to something else, so until i run into the issue again, I no longer have an example to show...