The following will allow you to test Chrome with a Vivaldi user agent. Shutdown Chrome and start a Terminal (or
cmd.exe on Windows), then paste in the code that is relevant for your platform and press “Enter”–you can triple-click to select an entire line.
Testing with Chrome
NOTE: There is little point testing in Vivaldi because old versions already had workarounds for these specific issues and from 2.10 onwards we use a Chrome User Agent string.
"%PROGRAMFILES(X86)%\Google\Chrome\Application\chrome.exe" --user-agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.94 Safari/537.36 Vivaldi/2.10.1745.21"