If you want websites to think that you are using another browser, use the add-on called “User-Agent Switcher and Manager.” This tool changes your user agent. You can tell websites that you are using Google Chrome, when in reality you are using Firefox.
You can choose from many versions of your desired browser. You can also let them think you are on mobile or macOS when you are, in fact, using Windows.

The add-on is available on all web browsers. Download it for Mozilla Firefox, Google Chrome, Microsoft Edge or Opera. Of course, you can also download it for Brave or Vivaldi. Just use the Chrome web store to download it for these browsers that have no store.