This has done this for (years?) on CodePen in @firefox. We have a totally normal <link rel=“stylesheet”> at the top of the page that is supposed to be render-blocking, yes? Would love to understand.
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I still don’t understand why, but there is a solution for now. We didn’t have any <script>s in our <head>, so just putting one there with a comment fixes it. <script>/* Firefox needs this to prevent FOUC. */</script> </head> Hattip @JasonEtco
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P sure that's true, but my grasp is the details is shaky too.
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Firefox blocks rendering on stylesheets in the head, and also blocks script execution on them. Issues can result from things like <script defer> that runs at weird times, addons that run their own script at weird times, and perhaps some other bugs. Curious what addons in use.
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Replying to @davidbaron @tabatkins @estellevw @chriscoyier @firefox @JasonEtco
@bz_moz is the expert on this, though.

Jun 20, 2019 · 11:38 PM UTC

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