このブックマークレット使うとコンソール出せます

(function(){
    const old = document.getElementById('console');
    if(old){
        old.parentElement.removeChild(old);
        window.console = window._console;
    }
    const setStyle = function(){
        const s = document.createElement('style');
        s.innerHTML = `
    /* The console container element */
    #console {
      position: absolute;
      width: 330px;
      height: 240px;
      background-color:black;
    }
    /* The inner console element. */
    .jqconsole {
        padding: 10px;
    }
    /* The cursor. */
    .jqconsole-cursor {
        background-color: gray;
    }
    /* The cursor color when the console looses focus. */
    .jqconsole-blurred .jqconsole-cursor {
        background-color: #666;
    }
    /* The current prompt text color */
    .jqconsole-prompt {
        color: #0d0;
    }
    /* The command history */
    .jqconsole-old-prompt {
        color: #0b0;
        font-weight: normal;
    }
    /* The text color when in input mode. */
    .jqconsole-input {
        color: #dd0;
    }
    /* Previously entered input. */
    .jqconsole-old-input {
        color: #bb0;
        font-weight: normal;
    }
    /* The text color of the output. */
    .jqconsole-output {
        color: white;
    }
    /* The text color of the output. */
    .jqconsole-warning {
        color: yellow;
    }
    /* The text color of the output. */
    .jqconsole-error {
        color: red;
    }
    /* The text color of the output. */
    .jqconsole-info {
        color: blue;
    }
    /* The text color of the output. */
    .jqconsole-return {
        color: gray;
    }
`;
        document.head.appendChild(s);
    };
    setStyle();

    const loadScript = function(src, cb){
        const s = document.createElement('script');
        document.head.appendChild(s);
        s.onload = cb;
        s.src = src;
    };
    const loadStyle = function(src, cb){
        const s = document.createElement('link');
        document.head.appendChild(s);
        s.onload = cb;
        s.href = src;
        s.rel = 'stylesheet';
    };

    const initConsole = function(){
        var d = document.createElement('div');
        d.id = 'console';
        document.body.appendChild(d);
        $('#console').draggable();
        $('#console').resizable();
        var jqconsole = $('#console').jqconsole('', '');

        window._console = window.console;
        const writeString = {
            log(string){
                jqconsole.Write(string + '\n', 'jqconsole-output');
                window._console.log(string);
            },
            warn(string){
                jqconsole.Write(string + '\n', 'jqconsole-warning');
                window._console.warn(string);
            },
            error(string){
                jqconsole.Write(string + '\n', 'jqconsole-error');
                window._console.error(string);
            },
            info(string){
                jqconsole.Write(string + '\n', 'jqconsole-info');
                window._console.info(string);
            },
            isJqConsole: true
        };
        if(!window.console.isJqConsole){
            window.console = writeString;
        }

        jqconsole.RegisterShortcut('A', function() {
            jqconsole.MoveToStart();
        });
        jqconsole.RegisterShortcut('E', function() {
            jqconsole.MoveToEnd();
        });
        var startPrompt = function(){
            jqconsole.RegisterMatching('(', ')', 'parents');
            const prompt = '> ';
            jqconsole.Write(prompt, 'jqconsole-prompt');
            const processInput = function(input){
                try{
                    const result = eval(input);
                    jqconsole.Write(result + '\n', 'jqconsole-return');
                }catch(err){
                    console.log(err);
                    jqconsole.Write('ERROR: ' + err.message + '\n', 'jqconsole-error');
                }
                startPrompt();
            };
            jqconsole.Prompt(true, processInput);
        };
        startPrompt();
    };

    const jquiCss = '//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css';
    const jq = '//jscl-project.github.io/jquery.js';
    const jqui = '//code.jquery.com/ui/1.12.1/jquery-ui.js';
    const jqconsole = '//jscl-project.github.io/jqconsole.min.js';
    loadStyle(jquiCss, function(){
        loadScript(jq, function(){
            loadScript(jqui, function(){
                loadScript(jqconsole, function(){
                    initConsole();
                });
            });
        });
    });
})();