[lazylion2]

One trick that sometimes works for me on Firefox is shift+right click the video -> This Frame -> Open Frame in New Tab. and the dev tools work there

[extraduder_ire]

Sometimes, especially if you're on the mobile version of the site, the video will be an actual <video> tag you can open in another tab.

Also, the "Open With"[0] browser extension can detect a video/frame's URL when you right click on it, if you want to use that to quickly open it in yt-dlp/mpv.

0: https://addons.mozilla.org/en-US/firefox/addon/open-with/