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The bad thing about Flash video was that it required a third-party plugin to play the content. The good thing was I could select which content to play; using the click-to-play feature in Firefox and Chrome.

But now that HTML5 video is getting popular, I see a lot of ads popping into view again. They are not only a distraction, they hog resources on my computer and make the fans spin full speed.

Is there a way to disable HTML5 audio/video content by default, and enable it only selectively?

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@kinokijuf HTML5 is not just a buzzword— it's a collection of technologies that adhere to formal specs put out by the W3C, found here: . Likewise, “HTML5 audio/video” are specific standards for encoding audio & video and presenting them in web browsers (using HTML5's <audio> and <video> tags). More information on HTML5 audio & video on Wikipedia: / – Slipp D. Thompson Jul 24 '15 at 20:01
“HTML5” is a buzzword. Please specify what you want to disable. It’s pretty clear (if you actually bothered to read the question, especially the second and last lines) what he wanted/wants to disable: HTML5 video and audio elements. – Synetech Jul 25 '15 at 1:01
up vote 14 down vote accepted

In Firefox you can set media.autoplay.enabled to false in about:config though as of now this may not be sufficient for every case. An extension like NoScript (default settings) could be used to complement the missing functionality or even otherwise used by itself without the about:config setting. In NoScript it's also possible to extend the functionality to whitelisted sites (NoScript Options > Whitelist) via NoScript Options > Embeddings: Apply these restrictions ...

about:config Entries

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This works, thanks! I luckily use NoScript already. Still looking for a setting in Chrome. – HRJ Nov 8 '13 at 3:10
No problem :) Regarding Chrome, this thread (though not related to Chrome settings) could be helpful. – vWil Nov 8 '13 at 15:34
Firefox 34.0 sure autoplays HTML5 video as if Minitrue itself had ordered it to in Jan 2015 (case of: no Flash installed, NoScript installed with "Forbid Other Plugins" set to 'true' and with Firefox "about:config - media.autoplay.enabled" = false) and there is as yet no way to disable that. Oh well. Bug 659285 mentioned in the response above seems to indicate the FF developers are in some kind of quandary about how to control invocations of play(). I hope this gets solved. – David Tonhofer Jan 11 '15 at 7:35

For Chrome/Chromium, there is HTTP Switchboard (available in Chrome store or github). There is a column in the matrix which can be selectively be turned on or off, which turn on/off HTML5 video/audio/SVG/fonts -- for whatever hostnames you wish.

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Link to Chrome Webstore:… – joeytwiddle Aug 5 '14 at 20:56
It's now uMatrix on GitHub and Chrome Store (Along with uBlock Origin) - and from toying with it, it seems the "Other" column controls video/audio content. Never have auto-video, but this story would play and I just found the column. Other options haven't seemed to work for me. – WernerCD Jul 14 '15 at 17:26

In Firefox 36.0.4 open about:config and search for media.webm.enabled set this to false and the html5 videos will not play anymore. ;)

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For Chrome, I am satisfied with Stop HTML5 Video Autoplay. Does not prevent loading but good enough to prevent media from auto playing.

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Well, it's now called "Stop Youtube HTML5 Autoplay" and it doesn't stop this page (Not youtube) from playing on my computer as far as I can tell. – WernerCD Jul 14 '15 at 17:28
This post helped me to disable ogv video. Setting media.ogg.enabled to false in about:config worked for me.

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According to a blogpost, to disable HTML5 and autoplay of videos in Mozilla Firefox is to force them to use Flash version.

Type about:config in the Mozilla URL field, make a new boolean with type media.html5video.blocked and give it value of true.

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Nothing worked for me.. tried everything but html5 still sneaked in.

Ultimately.. installed opera 28, installed extension "Disable Youtube™ HTML5 Player" and it's good now.

hope this helps.

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The YouTube Flash Player extension for Firefox or Chrome will allow that.

A very lightweight add-on that forces YouTube to play videos using Flash Player because it consumes less material resources (CPU, RAM) and offers more resolution choices than the HTML5 Player.

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The firefox extension Flash Control always worked for me. It disables autoplay of both flash and html5 media. It provides placeholders F for flash and V for html5 media that can be clicked to get played.

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