Actually, from what I can tell in my brief 15-minute internet search, every version of Windows since NT has accepted both because DOS 2.0 supported both. The exception to this was Command Prompt. But, these days, it supports both. Not sure when they made that change in Command Prompt, but I think it’s been that way since at least Windows 7.

Technically, Windows understands both / and \. I personally always use / just because it’s easier to type that.

Yeah, I think Firefox’s translation feature is technically still in beta.

Firefox has translation now, too, on both mobile and desktop.

And you can optionally add the Google Translate extension to desktop Firefox if you want. (It really is convenient, isn’t it?)

And you can always just plug in the URL of whatever page you’re trying to translate directly into https://translate.google.com/.