It works most of the time but some sites won't let me turn it on so they will not load.

Simple, blocks JS by default, doesn't request unnecessary permissions.
I'd give it 5 stars if it would bypass the browser cache upon tab reloading.

Just what I needed!

(but it doesn't work reliably on x64 or arm linux, on android it is somewhat better, but of late it also doesn't work perfectly. i don't use windows/macos/ios)

Does the job, but I'm not a fan of the yellow icon.

Good. As others have said would be better if you could toggle the default behaviour.

The default Javascript state is off for this extension, one click to enable it for the site/page (?) - and it remembers. This is exactly what I was looking for.
If you like it the the other way around, try "NJS" or "Quick JS switcher".
This gives me exactly what I want.

I really liked this add-on apart from its default policy, so I forked the Code and edited to change the default policy, and made a new extension https://addons.mozilla.org/en-US/firefox/addon/quick-js-switcher/ , feel free to install that.

Most sites need JS to operate, and allow each site separately will only make it difficult to browse, can you add the option that the default will be enableing JS?