I haven't really met anyone who is particularly bothered by these issues. They certainly should be addressed to some degree, but the issues I find people are bothered about in Firefox are something that Mozilla has very little control over: Bugs in sites. As a full-time firefox user, I commonly find that sites have bugs, and when I boot it up in Chrome just to check my hunch, they don't manifest. It's pretty easy to…
Web developers can help by using and endorsing Firefox in their coding tutorials/videos/screenshots.