If it hadn’t been for Firefox, chances are that we would all be looking at a closed, Microsoft defined, web right now with all the limitations and licence restrictions that woulkd come wrapped up in that. The Mozilla Foundation, who develop and distribute Firefox, are still going and still working to build a better web.
You can support them by Joining Mozilla. Not only do you get to feel warm and fuzzy, you get a freee t-shirt as well.
Thanks to @corenomial for the link.