These forums have just been updated so they are on the latest version, 18.104.22.168.
They are now fully secure. You should see the green lock icon in the top area of your browser window. The only reason you might not see that green lock on an individual thread is if someone included an image to show that is coming from a non-secure server. If you find one of those, please let me know.
The forums are also mobile friendly. They should display nicely on your phone or tablet.
Please let me know if you have any issues with any of these changes! Thanks!