How does using Firefox benefit open standards?
This is not a feature but nonetheless is a motivatation for many users: supporting Firefox by using it helps to push forward standards and accessibility for the entire web. Web tracking organizations are continually computing the percentage of overall web page views for each type of browser. The more market share Firefox gets, the more that web page developers care about supporting standards. Fortunately, it would appear that the main battle to make standards matter again has already been won. However, even more market share would really drive all companies to ensure their web browsers supported the standards equally well.
