What does that mean?
Netscape, Google, Microsoft and Apple have all been guilty of losing patience and ploughing ahead by adding features to their browsers that aren't fully standards-backed at one point or another, but it's usually the decisions of the market leader that have the biggest impact. Lots of people develop for Chrome and assume it'll work elsewhere as a result, or worse they don't care.
As a Firefox user, I don't like the results either. But I don't think any of the actors in question are acting in bad faith. Not even the lazy web developers who build Chrome-only games; why should they build shit for me, if they don't want to?
Anyway, someone made a suggestion of what to try in another comment, and turns out it was really easy, so now it's fixed. Firefox just does software blurring which is super slow and so I just had to turn that off entirely for Firefox. So Firefox performance is now okay enough, although still not quite like Chrome.
Actually I think Firefox supports them natively now but until very recently it didn't.
companies that move "faster than the standards" always do so under the guise of offering better products faster, but with the actual goal of locking in consumers to later enjoy a monopoly. see sony trying to always come up with a new media device, minidisc, memorystick, etc.
It's exactly the same with Google, they have become the Microsoft from before, being bad guys.
Slowly people are seeing it but they are not going to help by switching browsers it seems, so we are doomed to repeat this.
Remember when Microsoft started to move faster then specs with IE? At first, all office applications required IE to work and nobody cared. Then games. Then it was a mess and netscape died. Then it got better again.
Now we have chrome, with google moving faster then the specs. I can't even join a hangouts in my office because google didn't bother to update the plugins (after they forced their own plugin into obsolesce by pushing the chrome extension format as a standard and lobbying firefox to adopt it). Now games. Wonder how long firefox will last this time.