It's pretty rare for JavaScript to actually be disabled on Firefox. If a website is telling you that JavaScript is disabled, it's far more likely that Enhanced Tracking Protection is blocking some piece of JavaScript from loading on that website, leading the website to believe that JavaScript is disabled on your browser. In most cases, this can be bypassed by disabling Enhanced Tracking Protection on that specific website. See [[Enhanced Tracking Protection in Firefox for Android]] for more information. Hope this helps.