Firefox

Here is the problem with changing the user agent (IMO). It just re-enforces the idea that Chrome/Chromium browsers are the only browsers and therefore sites should just be coded for them. Which they are currently the most common for people to be using since even Microsoft gave up on IE and the original Edge. But the fact that Microsoft and Google are still the most dominate OS'es means that we are just seeing IE all over again. With sites being coded to only expect Chromium, then they are just set to not even allow them to be loaded by anything else.

The fact that so many of the sites do in fact work with Firefox/Safari when the user agent is set to falsely report that it is Chrome/Chromium should be kind of concerning. Just leads to false narratives that other options are not worth using due to being bad products. Kind of like how in the US we are conditioned to believe that there are only two parties to choose from and all other options shouldn't be allowed or are never okay to support.