I create a dedicated profile in Firefox for tor (with firefox -no-remote -p) and configure it to use specific network setting with Edit > Preferences, Advanced > Network > Settings
And then:
manual proxy configuration:
http proxy port: 0
ssl proxy port: 0
ftp proxy port: 0
socks host 127.0.0.1 port: 9050
In addition, I use the plugins NoScript and HTTPS Everywhere, as Torbrowser do.
But, when I open https://check.torproject.org/ with this Firefox’s profile, I get :
Congratulations. This browser is configured to use Tor.
However, it does not appear to be Tor Browser.
So, there is a real reason to use Torbrowser instead of my dedicated Firefox’s profile system?