Version Happy New Year updated:
- Add 2017 skin, add  clan.
- Features [Partycode] is back.
Install Slither.io Mods on Firefox and related browser
- Try to install Greasemonkey extensions on Firefox, and Install Tampermonkey on Safari/Chrome
- Install Tampermonkey at here.
- Install Greasemonkey or Tampermonkey add-on for Firefox. Download with link below:
- Greasemonkey: https://addons.mozilla.org/en-US/firefox/addon/748/
- Tampermonkey: https://addons.mozilla.org/en-US/firefox/addon/tampermonkey/
- Click here or link at the end post to download user scripts.
- For Tampermonkey:
- For Greasemonkey: Greasemonkey will call you up to select Install button, just click it when you are asked so that you can confirm this installation on Firefox. Click Install