One example that I personally remember is when Gmail and Youtube is stopped working on Opera browser. But if you customize user agent to any other browser (like

One example that I personally remember is when Gmail and Youtube is stopped working on Opera browser. But if you customize user agent to any other browser (like Firefox) it suddenly start to work. [1] It happened decade ago tho.. Now Google is practically leader in web standards so there no need to use this practice anymore. 1. https://www.reddit.com/r/operabrowser/comments/e6e7x/google_constantly_blocking_opera/ https://www.reddit.com/r/operabrowser/comments/e6e7x/google_...