It's usually super critical things that don't work, for example: I couldn't apply to become a registered engineer in my state using Firefox because the form wa

It's usually super critical things that don't work, for example: I couldn't apply to become a registered engineer in my state using Firefox because the form was in an iframe, and for some reason the iframe didn't render on FF. The credit portal for Shell Fuels only works in Chrome and doesn't display at all in FF due to a console error. (Enough of the page renders to make you think that the page is complete but i.e. the buttons to apply or make a payment don't render). The field for setting the date of a consultation (work) in our accounting package doesn't work in FF, and no matter how many times I write to their support team they just write back with "Firefox is not supported, please download Chrome". There was a similar attitude at a software company I worked prior, but I managed to wear them down and get Edge (modern), Firefox and Safari on the QA supported browser list with the reasoning that they are the default browsers for Windows, Linux and macOS respectively. But come on, browser standardization is so good these days I honestly don't understand how people are making pages that only work in Chrome?