For the longest time, government websites in Iran required using Internet Explorer to access. A few years ago, it started to change. Now most of them refuse to

For the longest time, government websites in Iran required using Internet Explorer to access. A few years ago, it started to change. Now most of them refuse to work with anything but Chrome. At least in this sense, Chrome is really the new IE. And no, it's not because there is a standard Firefox does not support. I have installed a user agent switcher add-on on Firefox and that has been sufficient to let me use them. Like back in the days of IE, web developers do not care about users of non-dominant browsers to bother testing on them, and prefer to block them from access instead of risking receiving the occasional bug report or complaint from someone on Firefox or Safari.