Probably less annoying, but there's still a time and effort cost to publishing on both Chrome and Firefox as well. They don't have the same policies, the APIs have differences, they have their own bugs, and the submission/review process is different for each. It's a real drag, compared to pushing updates to a website.
Also, with the Chrome store right now, once you push an update for review, there's no way to replace it with a newer update until the (up to 3 weeks) review process finishes so say goodbye to pushing quick fixes, automated deploys and fast iterations. It's ridiculous.