Mozilla Firefox does not have the capability to support preloading

I am having an issue with preloading CSS sheets. I attempted to preload the CSS sheet using the preload attribute in HTML. It works fine on Google Chrome, but unfortunately, it does not work on Firefox.

<head>
    <link href=assets/css/master.css rel=preload onload="this.rel='stylesheet'" as="style" type="text/css">
    <link rel="preload" href="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.3.4/assets/owl.carousel.min.css"
        as="style" onload="this.rel='stylesheet'" as="style" type="text/css">
    <link href="https://cdnjs.cloudflare.com/ajax/libs/OwlCarousel2/2.2.1/assets/owl.theme.default.min.css" rel=preload
        onload="this.rel='stylesheet'" as="style" type="text/css">

    <link rel=apple-touch-icon-precomposed href=images/favicon-apple-touch.png> <link rel=icon href=assets/img/logo.png
        sizes=32x32>
    <link href="https://fonts.googleapis.com/css?family=Bad+Script" rel=preload onload="this.rel='stylesheet'" as="style">
</head>
htmlcssfirefoxoptimizationpreload

Answer №1

It seems that Firefox 85 finally implemented the preload attribute on January 26, 2021 as reported by caniuse.

Coming soon! Check out Bugzilla for more details.

Learn more about preload support here.

Currently, you can only manually enable preloading by turning on the network.preload flag in Firefox.

Edit in September 2020:
Still under development: More information on the status of link-rel-preload.

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