1514793 - Custom Protocol problem after version 64 update

Status: RESOLVED DUPLICATE of bug 1514834

(Firefox :: Untriaged, defect)

Description

[rdelay]

Attachment: firefox error.jpg

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0

Steps to reproduce:

We have a custom protocol and a launch page that tries to launch it and if it cant it will try to download and install the app to register the protocol.  Once Firefox updated to 64 this stopped working.  From what I can tell the catch never gets triggerd in the function below:

    function openUriUsingFirefox(uri, failCb, newInstall) {
        var iframe = document.querySelector("#hiddenIframe");
        if (!iframe) {
            iframe = _createHiddenIframe(document.body, "about:blank");
        }
        try {
            iframe.contentWindow.location.href = uri;
        } catch (e) {
            if (e.name == "NS_ERROR_UNKNOWN_PROTOCOL") {
                failCb();
            }
        }
    }


we have made no code changes and Version 63 worked just fine.


Actual results:

The page stops processing because the try never fails.


Expected results:

The try should fail and then call the failCB() function in the catch.  See the attached screen show from the catch() while running version 63