With browser extensions, almost nothing is impossible. Let's test where "almost" lies! It doesn't matter if you want the extension just for yourself, your classmates, or the entire world for generations to come — I'm happy to discuss them all. I have been working on my personal and other's extensions for nearly two years full-time; and for 5+ years on web technology in general. I work with browser APIs so closely that it's not rare to see me diving into Chromium source code.