B2G and Firefox OS did some legitimately cool things - they still have a better blended app+web experience than anything mainstream that I've touched. Android's crappy instant apps are laughable in comparison. There's plenty to learn from that experiment(?).

The rest of it, yeah. Absolutely agreed. Electron not having a Firefox equivalent in particular strikes me as a major, multi-year... not oversight, that's far too polite. Self-ostriching? I'm continually astounded beyond words. The market is massive, and nauseatingly ripe for competitors.