Chrome扩展程序上的“不安全评估”

我正在尝试运行以下命令：

chrome.tabs.onCreated.addListener(function (tab){
    if (tab.url.indexOf(".salesforce.com/") != -1 || tab.url.indexOf(".force.com/") != -1) {
        chrome.tabs.executeScript(tab.id, {
            "file": "loadScript.js"
        }, function () {
            console.log("Script Executed .. ");
        });
    } else {
        var wrongTab = chrome.i18n.getMessage("wrongTab");
        console.log(wrongTab);
        alert(wrongTab);
    }
});

从理论上讲，哪个应在页面加载时运行loadScript.js文件...。loadScript.js文件如下所示，这应将文件追加到正在运行的页面，而不是当前的后台页面。 ：

/* Create a scriipt element in head of HTML and put /soap/ajax/31.0/connection.js in the src  */
var connectJsUrl = "/connection.js";

function loadScript(url, callback) {
    var head = document.getElementsByTagName("head")[0];
    var script = document.createElement("script");
    script.src = url;
    var done = false;
    script.onload = script.onreadystatechange = function() {
        if (!done && (!this.readyState || this.readyState == "loaded" || this.readyState == "complete")) {
            done = true;
            callback();
            script.onload = script.onreadystatechange = null;
            head.removeChild(script);
        }
    };
    head.appendChild(script);
}

loadScript(connectJsUrl, function() {
    console.log("Script Confirmed...")
});

/* Check to see if the file have been appended correctly and works correctly */
var JSFile = "chrome-extension://" + window.location.host + connectJsUrl;
var req = (window.XMLHttpRequest) ? new XMLHttpRequest() : new ActiveXObject("Microsoft.XMLHTTP");
if (req == null) {
    console.log("Error: XMLHttpRequest failed to initiate.");
};
req.onload = function() {
    try {
        eval(req.responseText);
    } catch (e) {
        console.log("There was an error in the script file.");
    }
};
try {
    req.open("GET", JSFile, true);
    req.send(null);
} catch (e) {
    console.log("Error retrieving data httpReq. Some browsers only accept cross-domain request with HTTP.");
};

我仍然是Chrome扩展程序和.js的新手，如果我犯了一个愚蠢的错误，请原谅：)

我从中得到的是以下内容：拒绝将字符串评估为JavaScript，因为在以下内容安全策略指令中不允许使用'unsafe-eval'脚本来源：“ script-src'self'chrome-extension-resource ：“。