You can add functionality to chrome or other web browsers (opera, firefox, safari) without diving deeply into native code.
Some most popular browser extensions:
- AdBlock: Blocks YouTube, Facebook, and ads everywhere else on the web.
- Save to Pocket: extension allows you to add the article into your pocketapp account so you can read it later.
- AlexaRank: See websites alexa rank direct into your browser without leaving the page.
- LastPass: Saves your passwords and gives you secure access with only one password