Linerider.com uses userscripts as the primary method of supporting mods. The following tutorial will walk through how to set up a userscript manager and install userscript mods.
Downloading Userscripts
1) Install a userscript manager supported by your browser. There are multiple options available, but this guide recommends Tampermonkey. This will allow mods to run during a linerider.com browser instance.
2) Install a mod loader. This will be responsible for registering each mod you install and providing UI to interact with them. Here are the two options for mod loaders:
Installing from GitHub
Installing in Tampermonkey
3) Choose any number of mods to install. Mods can be found at the GitHub repositories listed here.