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It's because modern client-side frameworks like react or vue use javascript for routing, and in fact storing every character in a form as you type it is a basic design principle in such frameworks. If you are curious, you can install their respective dev tool extensions so you can tell at a glance which framework a website is using by checking which button lights up in the browser toolbar.

I like the uBlock Origin toggle myself, aka the "naughty website gets no javascript" button.

I've noticed over time that requiring JS correlates heavily with low quality content and other abusive behavior, so closing the tab saves me time and nothing of value is lost.

I have used this as a general policy for whether or not I interact with a site since about 2004. That policy has kept me 100% off Twitter, Facebook, etc, since they appeared. I highly recommend, for those who can live without the modern web reality.

I do that regularly, just allowing few websites and only for certain js, FF Reader also help sometime...