The Firefox ripple effect

Firefox changed the world forever.
Firefox got released it was precisely on the right time when Internet Explorer was under heavy press attack of its increasing vulnerabilities.
Mozilla's perfect marketing
spreading
not just amongst expert computer users, but also on universities and colleges
the press found out,
Opera Software saw this happening and they really learned from it.
the introduction of tabs instead of full MDI
make the Opera web browser free.
Microsoft's Internet Explorer
lost a larger portion of its shares to Firefox.
Microsoft finally took up the task, reformed the Internet Explorer team that was disbanded and now actively works on improving their web browser