[xeeeeeeeeeeenu]

It actually reduces the security because exit nodes are likely to MITM you.

[yjftsjthsd-h]

So install an extension to block non-HTTPS pages and you're golden

[hombre_fatal]

fwiw, Tor Browser comes with HTTPS Everywhere, though you need to click the add-on's icon and enable "Encrypt All Sites Eligible" to block non-HTTPS.