When developing a PowerApps in the PowerApps Studio, make sure you are using a supported browser. You may not even realize that the browser is not supported till you run into something that’s not working – from that standpoint, it might be worth it for the PowerApps Studio to be a bit more proactive, maybe by displaying a warning message of some sort.. But, in the absence of such a message, just keep in mind that some browsers, and, in particular, Firefox, are not supported for PowerApps Studio:
Actually, FireFox will work for some basic scenarios, but there are features that won’t be working. For example, “delete custom card” button, even though still visible in FireFox, won’t be functional:
