[rene_bg]

You can use [1] to force YouTube videos being streamed as H.264 instead of VP8/9. This helps with the battery issue (at least on YouTube).

[1]: https://addons.mozilla.org/en-US/firefox/addon/h264ify/

[vim_wannabe]

I think browser makers (or whoever it needs to be) should offer an option to save battery over a little bit of extra bandwidth. Maybe even make it the default.

[the8472]

youtube's logic selects the codec, not the browser

[pests]

Not if the browser only advertises support for the one it wants YouTube to pick.

[ComputerGuru]

No, it’s a negotiation wherein the client submits its list of supported protocols and the server chooses between them.

[icebraining]

And since FF supports both, it's YouTube which is choosing the codec, as the8472 wrote.

[pests]

And what vim_coder and ConputerGuru meant was that Firefox would present a spoofed list of supported codecs to YouTube to force selection of the higher bandwidth, lower-powered codec.

Just because Firefox technically supports a format doesn't mean it has to disclose that format to external servers for selection.

[icebraining]

Having custom behaviors for specific sites is a terrible practice. Browsers are complex enough as they are without an extra layer of hacks.

[frik]

Good to know, but at least for me actually occurs with MP4 files. I tried it on my own video MP4/H.264 files - loading the video with the video tag with plain HTML5. I am sure the FF devs know about the FF57 video bug and have fixed it already in nightly build or are working on it.