I've had a developer phone and was quite disappointed with the system. If you really want to sell the advantages of HTML/JS apps, the default ones should've been a lot nicer and full-featured.
I bought two of them. Different. They never worked, and were both slow. Mailed one to a fellow HN'er in India, used the other for awhile but was unable to recompile the OS to get things fixed and received zero support online. Felt like the whole thing was compromised from the word go by business people, from my perspective.
I will repeat my take here, for the last time, on where they screwed up: They screwed up by pretending to target low end devices but still only supporting centralized communications. They should have had Ad-hoc/Mesh Wifi as a requirement, and designed the OS API to give those features to developers. Developing world people want to send things between one another, not huddle around shared wifi or pay premiums to carriers. I wrote this up in some detail at https://bug945047.bugzilla.mozilla.org/attachment.cgi?id=840... ... nobody bothered to reply, except for "wifi supports in FFOS is relied on wpa_supplicant which is provided by partner mostly", ie. the business setup within Mozilla was that the actual device manufacturers were the ones who had control of the wpa_supplicant build, and there was no way for the developers to rely on, require or enforce features in that software being present. Nobody took ownership, everyone lost.
I still miss WebOS and my Pre.