URL: https://www.flightradar24.com/FIN25J/35450b0a

Browser / Version: Firefox 115.0
Operating System: Windows 7
Tested Another Browser: No

Problem type: Site is not usable
Description: Browser unsupported
Steps to Reproduce:
Site message:
"Issue with your browser

Unfortunately, your current browser does not support WebGL which is essential for the functioning of Flightradar24. Please change to a supported browser and try again. WebGL is supported by most major browsers including Chrome, Firefox, Safari, Edge and Opera."
Message from Mozilla support: Firefox is up to date

View the screenshot

From webcompat.com with ❤️