Youtube your browser does not currently recognize firefox

YouTube states "Your web browser does not presently identify any of the video styles available" rather of offering flash fallago, after I enter the HTML5 trial and watch a video that we can"t play

You watching: Youtube your browser does not currently recognize firefox

YouTube states "Your web browser does not currently identify any type of of the video layouts available" instead of giving flash fallearlier, after I enter the HTML5 trial and also watch a video clip that we can not play
Shared components provided by Firefox and other software, including dealing with of Net content; Gecko, HTML, CSS, layout, DOM, scripts, imperiods, networking, and so on. Issues with internet page layout most likely go here, while Firefox user interchallenge worries belengthy in the Firefox product. (More info)
For troubles concerned the HTML 5 media aspects ( and also ) -- including WebM, MP4, MSE and EME concerns. This would also typically include decoding difficulties in the codecs themselves (e.g. VP8, VP9, H.264, AAC) experienced throughout playearlier.
a11y-review ---
Webcompat Priority ---
Root Cause ---
user-doc-firefox ---
Fission Milestone ---

Tracking Status
relnote-firefox ---
thunderbird_esr78 --- ---
firefox-esr78 --- ---
firefox87 --- ---
firefox88 --- ---
firefox89 --- ---

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in-qa-testsuite ? + -

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STR: 0. 1. Visit and click the attach to sign up with the html5 trial. 2. Visit RESULTS:The video doesn"t fill (and no flash fallearlier loads). Instead, I acquire a stylized static graphic, with message saying "Your internet browser does not presently acknowledge any of the video layouts easily accessible."EXPECTED RESULTS:Flash fallback video must load.If I leave the HTML5 trial, then whatever functions properly.Not certain if this is a YouTube bug, a firefox bug, or an interactivity. However before, I can"t repro in our present release, so it smells favor a regression.Broken in nightly: (X11; Linux x86_64; rv:22.0) Gecko/20130324 Firefox/22.0WFM in release: (X11; Ubuntu; Linux x86_64; rv:19.0) Gecko/20100101 Firefox/19.0