My current hassles with Firefox, Flash, and (HTML5) video

September 14, 2014

When I've written before about my extensions, I've said that I didn't bother with any sort of Flash blocking because NoScript handled that for me. The reality turns out to be that I was sort of living a charmed life, one that has recently stopped working the way I want it and forced me into a series of attempts at workarounds.

How I want Flash and video to work is that no Flash or video content activates automatically (autoplay is evil, among other things) but that I can activate any particular piece of content if and when I want to. Ideally this activation (by default) only last while the window is open; if I discard the window and re-visit the URL again, I don't get an autoplaying video or the like. In particular I want things to work this way on YouTube, which is my single most common source of videos (and also my most common need for JavaScript).

For a long time, things worked this way with just NoScript. Then at some point recently this broke down; if I relied only on NoScript, YouTube videos either would never play or would autoplay the moment the page loaded. If I turned on Firefox's 'ask to activate' for Flash, Firefox enabled and disabled things on a site-wide basis (so the second YouTube video I'd visit would autoplay). I wound up having to add two extensions to stop this:

  • Flashblock is the classic Flash blocker. Unlike Firefox's native 'ask to activate', it acts by default on a per-item basis, so activating one YouTube video I watch doesn't auto-play all future ones I look at. To make Flashblock work well I have disabled NoScript's blocking of Flash content so that I rely entirely on Flashblock; this has had the useful side effect of allowing me to turn on Flash elements on various things besides YouTube.

    But recently YouTube added a special trick to their JavaScript arsenal; if Flash doesn't seem to work but HTML5 video does, they auto-start their HTML5 player instead. For me this includes if Flashblock is blocking their Flash, so I had to find some way to deal with that.

  • StopTube stops YouTube autoplaying HTML5 videos. With both Flashblock and StopTube active, YouTube winds up using Flash (which is blocked and enabled by StopTube). I don't consider this ideal as I'd rather use HTML5, but YouTube is what it is. As the name of this addon sort of suggests, StopTube has the drawback that it only stops HTML5 video on YouTube itself. HTML5 video elsewhere are not blocked by it, including YouTube videos embedded on other people's pages. So far those embedded videos aren't autoplaying for me, but they may in the future. That might force me to not whitelist YouTube for JavaScript (at which point I almost might as well turn JavaScript off entirely in my browser).

    (An energetic person might be able to make such an addon starting from StopTube's source code.)

Some experimentation suggests that I might get back to what I want with just NoScript if I turn on NoScript's 'Apply these restrictions to whitelisted sites too' option for embedded content it blocks. But for now I like Flashblock's interface better (and I haven't been forced into this by being unable to block autoplaying HTML5 video).

There are still unfortunate aspects to this setup. One of them is that Firefox doesn't appear to have an 'ask to activate' (or more accurately 'ask to play') option for its HTML5 video support; this forces me to keep NoScript blocking that content instead of being able to use a nicer interface for enabling it if I want to. It honestly surprises me that Firefox doesn't already do this; it's an obviously feature and is only going to be more and more asked for as more people start using auto-playing HTML5 video for ads.

(See also this question and its answers.)

Comments on this page:

By James (trs80) at 2014-09-15 22:52:39:

Using Firefox HTML5 for YouTube is a bit naff at the moment, you can only get 360p or 720p (if it exists), any other resolution requires media source extensions which Firefox doesn't yet support.

Written on 14 September 2014.
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Last modified: Sun Sep 14 01:15:58 2014
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