I’ve heard that prices fluctuate based on the operating system you use.
That’s a new one. Never heard of that one. Should probably check and see if Opera still allows you to change how it identifies itself online. I think it still allows you to identify as another browser, but I have not checked lately. I do know earlier versions allowed you to change every identifying field, including browser type, version, computer type, and running OS.
Mine used to be configured to read as IE running in DOS 5.0 on a TI-99/4A.