They didn't lose that. They just signed an agreement with MPEGLA that anyone can use WebM for free. Firefox implemented WebM support. WebP is already being used by Facebook and many others and saves them millions making the open web faster, it'll be in Firefox soon. You also conveniently forgot WebSockets, Web Components, SPDY and WebRTC (they spent millions on iLBC and others that they just gave away for free to everyone including Mozilla, saving everyone years of R&D) and all the amazing work Ian Hickson has done on the _whole_ HTML5 API. Edit: there's also https://code.google.com/p/angleproject/ without which Firefox wouldn't have WebGL on windows. There is more but you get the idea.
Criticizing Chrome 'apps' for having non-standards API is ridiculous because Firefox does the exact same thing: Firefox addons. They have their own proprietary non-standard API: https://addons.mozilla.org/en-us/developers/docs/reference How evil! What people don't seem to understand is that Chrome Apps are just like Firefox Addons, so it's hypocritical to criticize the former and not the latter. And the Chrome UI did revolutionize the field, every browsers copied it and that's a good thing! Just saying that it was a huge contribution (among tons of others from Google, way more than Mozilla).
Google has been sponsoring Firefox for a long time even when they had an insignificant market share at the time. What you don't understand is that what's good for the web is good for Google. That's why they support even insignificant projects that may help the open web in the future (they even sponsor Open Street Map).
I'm not giving Google too much credit, they have literally spent more resources than Mozilla on the open web whether you like it or not. Are you seriously saying that Mozilla has a bigger budget than Google when it comes to the Open Web? If you think about it, Mozilla itself is part of Google's budget for the Open Web. They have also spent more than any other company be it Apple, or Microsoft or any other really. Just educate yourself on the topic.