Try user agent switcher. More often than not, websites work just fine with firefox but refuse to load when the browser identifies as not-fascist-google-trash.
Had to do that to do my fucking MATH HOMEWORK because Pearson "doesn't work with Linux". Switched my user agent to windows and all of a sudden it works just fine
I wish Mozilla would use some of their millions to bring a class action lawsuit against sites that pointlessly lock people out just because they're not using Chrome/Safari/Edge.
Reporting it to Mozilla can still help. Firefox has a built-in list of sites to fake the user agent header for, reporting it could land this site on that list as well.
I doubt it's malice as often as a cost saving measure presented in a scummy/lazy way.
The simple fact is that all browsers load pages differently.
If you want to minimise cost, you'll optimise the site to the most popular browsers.
Firefox, unfortunately, is at the very bottom of the popular browser list.
There's absolutely nothing else that most sites gain by promoting Google.
Except, as of recent, a lower likelihood of user having an ad blocker.
These companies typically have management take the IT advice from their IT managers, and if those intentionally block non Windows/Google/fascist software, you don't find anyone in the organization willing to listen to you. The only way to fight this is by not doing business with them whenever avoidable.
Yup, I like using a combo of ungoogled chromium and librewolf depending on which works better for certain websites or web apps . To me, Linux is about using the right tool for the job.
It sure would be nice to have WebSerial as well. For some reason Mozilla seems to think users can't be trusted with it. They could at least add a compile time option to enable it. If someone knows how to compile a browser, they are probably smart enough not to give random websites access to their devices.