Snake (Slither.io zoom mod) автор Xera

The Snake Extension includes a zoom mod, custom backgrounds, and many other improvements! Have fun :)

Tip: Use the TAB key to hide the UI elements.
You can view the source code on Github!

If you are experiencing issues with your FPS, do not worry. This is a bug in Firefox that is due to the default configuration of Firefox. Just fix it:
1. Enter about:config in the address bar and click on Accept the risk and continue
2. Enter layout.frame_rate above
3. Set the Hz (FPS) value that your monitor supports (-1 is automatic, but unreliable)