Firefox addon development, open a hidden web browser

Question

我正在开发Firefox插件，如何打开对用户隐藏的Web浏览器，但可以在插件代码中使用Javascript编写脚本？

Answer 1

SDK users should use the page-worker module.

XUL add-ons may insert a XUL <iframe type="content"> somewhere and make it hidden (eg .style.display = "none"; ). Also, you may want to disable images/plugins/script in that <iframe> .

Assuming window is a XUL window, such as browser.xul , here is an example reading the title of a website from a hidden <iframe> :

function readTitleFromPage(uri, callback) {
    callback = callback || function() {};

    let frame = document.createElement("iframe");
    frame.setAttribute("type", "content");
    frame.style.display = "none";
    document.documentElement.appendChild(frame);
    let docShell = frame.contentWindow.
                   QueryInterface(Ci.nsIInterfaceRequestor).
                   getInterface(Ci.nsIWebNavigation).
                   QueryInterface(Ci.nsIDocShell);
    docShell.allowImages = false;
    docShell.allowPlugins = false;
    frame.setAttribute("src", uri);
    let load = function load(e) {
        try {
            if (e.type == "load") {
                callback(frame.contentDocument.title);
            }
            else {
                callback(null);
            }
        }
        finally {
            // Always remove event listeners and the frame itself, at some point.
            // In this example, we don't need the frame anymore, beyond this point,
            // so remove it now.
            frame.removeEventListener("load", load, false);
            frame.removeEventListener("error", load, false);
            frame.removeEventListener("abort", load, false);
            frame.parentElement.removeChild(frame);
        }
    };
    frame.addEventListener("load", load, false);
    frame.addEventListener("error", load, false);
    frame.addEventListener("abort", load, false);
}

Of course, you can keep around the frame as long as you want, re-use it as many times as you want, and so on. But make sure to remove it once you don't need it anymore, to conserve resources (memory, CPU). Resetting it to about:blank while not needed might also be a good option.