Firefox has few tricks to prevent finger printing

1. There is a built in finger printing protection which helps a little bit but not perfect
2. There is containers: Putting different websites into different containers isolate them from one another so for example opening a website selling toys in one container would prevent your facebook account that is running in different container from knowing about this fact.
3. There is an extension called NoScript. This allow you to do what you want (block javascript) but since - as many others said - 99% of website won’t work without javascript, u could selectively allow certain javascript from certain domains while blocking others. By default all javascript are blocked but then u test enabling some to see what is the absolute minimum for certain website to work. NoScript remembers your selections so you only need to do it once per website.