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Firefox can't establish connection - websocket and heroku

I have problem with websocket connection on heroku.

Not sure where is the problem, because on other browsers it works. A similar issue was here:

Firefox Websocket security issue

If I understand correctly:

Something related to Heroku and backend is missing regards to security. Only Firefox care about this issue, other browsers not. Probably I can somehow ignore this error on firefox and allow a connection.

Below is the screenshot The connection used to fetch this resource was not secure - what exactly does it mean and how debug what and where is missing here?

enter image description here

Solution

  • After research, the reason for it was proxy on Firefox.

    If someone would have a similar issue, please do:

    1. Open the Firefox
    2. Go to about:preferences
    3. Open Network Settings
    4. Configure Proxy Access to the Internet and be sure there is "No proxy"