http://www.mpegla.com/main/programs/MPEG-DASH/Pages/Intro.as...
HLS has no such problems which makes it the better choice.
And Columbia University is in that patent trolls list. Disgusting.
UPDATE:
Going through that site, I found their attempt to leech on VC-1: http://www.mpegla.com/main/programs/VC1/Documents/vc-1-att1....
And they list Microsoft there, which is strange, since MS are part of Alliance for Open Media which is an antithesis of this trolling cartel. Either MS are sitting on both chairs, or MPEGLA are trying to fool everyone.
Apple was doing video [1] long before Firefox and the web were a thing; perhaps it's Mozilla that needs to get with the times and industry standards.
Mozilla is with the times. HLS works well in Firefox. You just do it with JavaScript and it's disappointing that Apple doesn't bother to do that on their website.
Here's an article on JavsScript based HLS from a couple of years ago:
Web browser considerations aren't relevant on iOS because Apple forbids alternative browser engines. Firefox on iOS is not Firefox because Apple doesn't allow it to use Firefox's JS runtime or Firefox's render engine. As a result there isn't any true browser competition on the iOS platform, which is a shame.
Personally, I want to run full, real Firefox on my iPhone. It's a low quality move from Apple that they stop me doing that.