I am the front-end coder of agariomods. Earlier, I was experimenting with modding slither.io as a little side project.
Because of the explosive growth of slither.io in the past week, mainly due to YouTube, I changed my focus to this. We will soon be releasing slither.iomods, which will also integrated into the original agariomods chrome extension.
This will take place after we finish transitioning from agariomods.com to iomods.com. At the time being, the mod is self-hosted by me, and can be used with Tampermonkey and Greasemonkey. Any feedback would be appreciated.
Make sure you disable any other slither.io extension and scripts first!
How to install user scripts?
Firefox and related browsers: Greasemonkey.
Google Chrome, Chromium, and related browsers: Tampermonkey.
Opera (version 15 and later): Tampermonkey or Violentmonkey.
Opera version 12 and earlier supports user scripts natively. Violentmonkey provides a friendlier UI and better compatibility.