Firefox used to work fine for me on iOs. At some point, pages stopped loading at all: the progress bar would make it to just under the (crossed-out) lock symbol on the left side of the address bar, and just stop there (but still flash). This happens for every website. All the other browsers work fine (DuckDuckGo, Chrome, Safari, etc.) - only Firefox does this.

I've tried clearing my data and restarting Firefox, but neither strategy works.