What is the difference between Chameleon and JShelter?

• Chameleon – Get this Extension for 🦊 Firefox Android (en-US)
  • Chameleon is a WebExtension port of the popular Firefox addon Random Agent Spoofer.
• JShelter – Get this Extension for 🦊 Firefox Android (en-US)
  • JShelter is a browser extension to give back control over what your browser is doing. A JavaScript-enabled web page can access much of the browser’s functionality, with little control over this process available to the user: malicious websites can uniquely identify you through fingerprinting and use other tactics for tracking your activity. JShelter aims to improve the privacy and security of your web browsing.
  • Like a firewall that controls network connections, JShelter controls the APIs provided by the browser, restricting the data that they gather and send out to websites. JShelter adds a safety layer that allows the user to choose if a certain action should be forbidden on a site, or if it should be allowed with restrictions, such as reducing the precision of geolocation to the city area. This layer can also aid as a countermeasure against attacks targeting the browser, operating system or hardware.

JShelter seems to spoof info by controls the APIs provided by the browser? and Chameleon spoofs user agent and many other information.

To me both seems to serves the same purpose of spoofing. Is Chameleon spoofing without interfering with js and JShelter spoofing with interfering with js the main difference between them? In addition JShelter seems to be able to block malicious js

How JShelter and Chameleon achieves spoofing differently?