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YouTube page load is 5x slower in Firefox and Edge than in Chrome because YouTube's Polymer redesign relies on the deprecated Shadow DOM v0 API only implemented in Chrome. You can restore YouTube's faster pre-Polymer design with this Firefox extension: https://addons.mozilla.org/firefox/addon/youtube-classic …
YouTube serves a Shadow DOM polyfill to Firefox and Edge that is, unsurprisingly, slower than Chrome's native implementation. On my laptop, initial page load takes 5 seconds with the polyfill vs 1 without. Subsequent page navigation perf is comparable.
To fix YouTube on Edge, you can install the Tampermonkey extension for Edge and this "YouTube Restore Classic" user script: https://openuserjs.org/about/Tampermonkey-for-Edge … https://openuserjs.org/scripts/Cpt_mathix/Youtube_-_Restore_Classic …
this is a weird move. If youtube loads slowly for someone they won't think it's their browser, but the site.
I assume Google has metrics showing that the Polymer redesign increases Firefox and Edge user engagement more than the slow polyfills hurt it. 
YouTube still serves the pre-Polymer design to IE11 by default so they could choose to serve it to Firefox and Edge too.
Or drives those users to Chrome 
We need an Edge addon that circumvents this lameness. Google needs another 5 billion fine
Here's a YouTube fix for Edge:https://twitter.com/cpeterso/status/1021943928524693504 …
I always wondered why @YouTube works like ass on Edge even though the browser works great with everything else.
To fix YouTube on Edge, you can install Tampermonkey extension for Edge plus this "YouTube Restore Classic" user script: https://openuserjs.org/about/Tampermonkey-for-Edge … https://openuserjs.org/scripts/Cpt_mathix/Youtube_-_Restore_Classic …
Will this script also work for Firefox?
Yes. You can use that Tampermonkey script in Firefox, but a much simpler solution is to install this "YouTube Classic" Firefox extension: https://addons.mozilla.org/firefox/addon/youtube-classic …
I admit that I am not 100% schooled on Polymer, but I have read this Tweet a number of times and I am really confused as to the statement. YouTube's new redesign relies on Polymer 1.0, by which is the only version that I know of that has a dependency on Shadow Dom v0?
From Polymer 2.0 docs > You can test Polymer 2.x by using the latest 1.0 version of webcomponentsjs, which is included as a bower dependency to Polymer 2.x. (webcomponentsjs versions prior to 1.0 support the older, v0 specifications for custom elements and shadow DOM.)
YouTube launched the Polymer redesign about a year ago. Polymer 2.0 and 3.0 support both Shadow DOM v0 and v1, but YouTube is still using Polymer 1.0.
Why anyone would use chrome is beyond me, a product by a company that already controls many critical elements of the internet.
Here’s what CNN looks like in Firefox iOS vs Chrome iOS.pic.twitter.com/YGlULDH5Qs
Firefox iOS and Chrome iOS both use WebKit (because Apple doesn't allow other web engines). Maybe those layout differences are due to Firefox Tracking Protection, the shield icon in the upper left corner? FWIW, http://cnn.com looks fine in my Firefox iOS.
Same here. http://Cnn.com on latest firefox for iOS on iPhone X.pic.twitter.com/mALaliIprr
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