And if someone's too lazy to install an add-on or on an unfamiliar computer, disabling Javascript is a simple as going to about:config, typing in "java", and double-clicking "javascript.enabled" to set it to false.

I personally find Firefox way too janky to use on my mobile device. It's getting better but still needs some time in the oven.

Brave is a Chrome fork so for those of us who prefer Chrome it's a better option (for now anyway).

use firefox with the noScript (cross fingers to have uMatrix on mobile soon!)

then use your 10 top websites with whitelisted javascript access on firefox mobile, and full javascript on chrome and came back to say which one was faster.