Chat site tlk.io won't work

I used to be able to chat on tlk.io in the Tor browser, but it stopped working (though I don’t know when, I didn’t try it for some time before now). I tried disabling privacy badger, enabling third party cookies, and allowing all scripts, but still no. I am in Standard security mode.

Any suggestions? Is this a bug or the result of a security tightening?

The problem with this site seems to be a block on some Tor exit nodes (Cloudflare) when trying to access a specific script, leading to a 403 error and an Undefined message in the JavaScript console - which breaks the site. To fix it I did the following (TB 14.5.4, security level Standard and no extensions installed):

  1. Navigate to https://tlk.io
  2. Open DevTools (I use Ctrl + Shift + I on Linux, keyboard shortcut depends on your OS)
  3. Click the Network tab
  4. Click the “Join” button on the site (enter channel to join first, if that is what you need to do)
  5. Observe the status of the various requests in the Network console. Here I saw a 403 error with a GET request for the rocket-loader.min.js resource
  6. If you see this, click on that request and copy the full URL from the headers pane
  7. Open a new tab and paste the URL into it
  8. Hit return to load the page
  9. If it fails to load change the circuit for the site (Ctrl + Shift + L for me)
  10. Repeat steps 8. & 9. until the script loads
  11. Go back to your original tlk.io/<channel> site tab and refresh it. It should now work

Is it a PITA? Sure, but this approach works a large number of site which ‘soft’ block Tor - i.e. some exit nodes, but not all. Good luck.