When we launched posterous in 2008, yes it was missing a bunch of features. But look at us now (or actually, in a month, we have a lot of stuff about to launch). We'll have everything all other blog platforms have, and more.

But SIX YEARS after gmail's launch, they can't say the same.

For Posterous, and any other web app, we'd have to decide the tradeoff. If we focused on one browser, could we add enough value to that experience that it's worth dropping support for Ubuntu Firefox?

Each browser and each developer should be able to decide this, instead of being slowed down by the platform as a whole.