[fatchan]

No. First of all, just check for `navigator.brave`. If it exists, it's Brave. When I ran a .onion site I added a JavaScript check and if navigator.brave was present, it redirected users to a specific page saying:

> Hey, there's something funny about your Tor Browser. When browsing Tor hidden services (.onion), you should be using Tor Browser. Are you using an outdated version, or perhaps something else entirely?

Brave is chrome. Tor browser is firefox, has a bunch of tweaks, different default settings, and a different fingerprint. Also when browsing on Tor, you should disable JavaScript as it's a source of many vulnerabilities.