There are days when I wish all JavaScript was illegal...
Step 1: Go to media website with Firefox on my mobile phone.
Step 2: Mobile phone hangs, gets hot, jerky scrolling, delayed scrolling, unprompted scrolling (as ads load and get inserted and reflow everything), combinations of all of these.
Step 3: Give up and use Firefox Focus for the same g.d. site, and it just works.
Some sites won't load at all though if you block JavaScript. They've ruined the internet.