[kodablah]

Embeddability. I've mentioned it on this site before, but Chrome's embeddability story (Electron, nw.js, CEF, Qt, etc) affects adoption more significantly than Mozilla prioritizers are giving credit for. Sure it's not an effect of Google itself, but that it exists only on one browser is something Mozilla should actively target. Of course there are a few attempts here and there, e.g. positron, but there needs to be a real effort to make the entire browser easily buildable and embeddable w/ an easy C API (doesn't have to conform to CEF like Servo was/is trying). Provide prebuilt libs and the headers and you will see adoption go up.