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 …
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Thanks, Alex! I've heard back from someone on the Polymer team who shared more details: IIUC, Polymer 2.x and 3.x should be compatible with Firefox's native implementation of Shadow DOM V1 (coming in Firefox 63, fingers crossed), though YouTube is still using Polymer 1.x and V0.
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That's correct. Note that YT *is* using polyfills, but not Shadow DOM V0; instead it's using Polymer's Shady DOM everywhere at the moment: https://www.polymer-project.org/blog/shadydom
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