Firefox 66 to block automatically playing audible video and audio

Re:Firefox 66 to block automatically playing audible video a... by Anon1096 on Monday February 04, 2019 @05:31PM (#19081302)

Most gifs being served on the web aren't .gif files anymore, but .webm or .mp4 files instead. That css wouldn't even stop half of the gifs most users see on a daily basis.

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Re:Firefox 66 to block automatically playing audible video a... by dredmorbius on Tuesday February 12, 2019 @09:17PM (#19149775)

I can assure you that:

1. The solution as posed works remarkably well. I know this because I use it myself.[1]

2. Extending the pattern to either be case-insensitive or include other animated image formats is pathetically trivial.

________________________________

Notes:

1. Specifically, in my "Annoyances" stylesheet, applied to all sites by default:

    /* gifs: So, it has come to this ... (xkcd) */

    img[src$=".gif"] {
        opacity: 0 !important;
        transition-delay: 3s;
        transition-duration: 1s;
        transition-timing-function: ease;
        transition-property: opacity;
        display: block;
    }

    img[src$=".gif"]:hover {
        transition-delay: 0.3s;
        transition-duration: 0.3s;
        opacity: 1 !important;
    }

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