I am getting the "You are using an incompatible web browser" error. How can I fix it?

Hello Mozilla Support, I am trying to use a website, but it shows the message "You are using an incompatible web browser." I am using the latest version of Firefox on my Android phone, but the website still does not work. I have already refreshed the page and restarted the browser. Please help me fix this problem. Thank you. ''Moderator note: Moved from the Firefox Desktop forum to the Firefox for Android forum.''