@A-E-SSC
No you do not. It is run through tampermonkey which is an extension added to your browser. All the script does it takes the information that Canvas is displaying in the browser and change how the information is actually displayed.
The only thing you need is the ability to install and use tampermonkey (some institution may prohibit that), then the script(s) are put into tampermonkey and they will run automatically on the pages they are used to modify. In order to use tampermonkey, you have to go to manage extensions and turn on developer mode - slide button on upper right for chrome.
The scripts that James has written do not change anything with your actual Canvas data - they just show them in a different manner.
Ron