There is no single "best" extension for RSS. Some popular options include:
- Feedly: A popular and widely used RSS reader extension for Chrome, Firefox, and Safari.
- The Old Reader: A minimalist and easy-to-use RSS reader extension for Chrome and Firefox.
- Inoreader: A more feature-rich RSS reader extension with a customizable interface and support for a wide range of platforms.
Ultimately, the best extension for you will depend on your personal preferences and needs. You may want to try a few different options to see which one works best for you.