Comment 14 for bug 1904789

how do I set a breakpoint early in the call stack?

Uncaught
Exception { name: "NS_ERROR_FAILURE", message: "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIURI.port]", result: 2147500037, filename: "chrome://pippki/content/exceptionDialog.js", lineNumber: 156, columnNumber: 0, data: null, stack: "getURI@chrome://pippki/content/exceptionDialog.js:156:7\naddException@chrome://pippki/content/exceptionDialog.js:386:13\n_fireButtonEvent@chrome://global/content/elements/dialog.js:487:19\n_doButtonCommand@chrome://global/content/elements/dialog.js:466:29\n_handleButtonCommand@chrome://global/content/elements/dialog.js:460:19\nInformUserOfCertError@chrome://messenger/content/mailWindow.js:685:10\nOnStopRunningUrl@chrome://messenger/content/mailWindowOverlay.js:2940:30\n", location: XPCWrappedNative_NoHelper }
exceptionDialog.js:156
    getURI chrome://pippki/content/exceptionDialog.js:156
    addException chrome://pippki/content/exceptionDialog.js:386
    _fireButtonEvent chrome://global/content/elements/dialog.js:487
    _doButtonCommand chrome://global/content/elements/dialog.js:466
    _handleButtonCommand chrome://global/content/elements/dialog.js:460
    _handleButtonCommand self-hosted:844
    InformUserOfCertError chrome://messenger/content/mailWindow.js:685
    OnStopRunningUrl chrome://messenger/content/mailWindowOverlay.