gistfile1

// http://photo.ameba.jp/user/nakamura-miu/0791ba741a0105htt5o811/
var base_dir = '/Users/youhei/Desktop/'
main()

function main() {
    var tmp = document.location.href.split('/').slice(-3)
    var n = [tmp[0], tmp[1]].join('_')
    var dir = base_dir + n
    var list = Array.filter(document.images, function(i) {
        return (i.width == 100 || i.height == 100)
    })

    // list = [list[0], list[1]]
    if (list.length > 1) {
        createDir(dir)
        list.forEach(function(i) {
            var s = get(i.parentNode.href)
            var m = s.match(/url=(.+?)"/)
            var u = m[1]
            var l = dir + '/' + u.split('/').slice(-1)[0]
            download(u, l)
        })
    }
    else {
        log('no item.')
    }
}

function log(arg) {
    Firebug.Console.log(arg)
}

function get(url) {
    var req = new XMLHttpRequest();
    req.open('GET', url, false);
    req.send(null);
    if (req.status == 200) {
        return req.responseText
    }
}

function download(url, path) {
    const PrefBranch = Components.Constructor('@mozilla.org/preferences;1', 'nsIPrefBranch');
    const IOService  = Components.Constructor('@mozilla.org/network/io-service;1', 'nsIIOService');
    const Transfer   = Components.Constructor('@mozilla.org/transfer;1', 'nsITransfer');
    const WebBrowserPersist = Components.Constructor('@mozilla.org/embedding/browser/nsWebBrowserPersist;1', 'nsIWebBrowserPersist');
    const LocalFile = Components.Constructor('@mozilla.org/file/local;1', 'nsILocalFile', 'initWithPath');

    var ios = IOService();
    var targetURI = ios.newFileURI((path instanceof Components.interfaces.nsIFile) ? path : new LocalFile(path))
    var sourceURI = ios.newURI(url, null, null);
    var persist = WebBrowserPersist();
    with(persist){
        var transfer = Transfer();
        transfer.init(sourceURI, targetURI, '', null, null, null, persist);

        progressListener = transfer;
        persistFlags =
            PERSIST_FLAGS_REPLACE_EXISTING_FILES |
            PERSIST_FLAGS_FROM_CACHE;
        saveURI(sourceURI, null, null, null, null, targetURI);
    }
}

function createDir(dir) {
    const LocalFile = Components.Constructor('@mozilla.org/file/local;1', 'nsILocalFile', 'initWithPath');
    var dir = (dir instanceof Components.interfaces.nsIFile) ? dir : new LocalFile(dir);
    if (dir.exists()) {
        if (dir.isDirectory()) {
            dir.permissions = 0774;
        }
    } else {
        dir.create(dir.DIRECTORY_TYPE, 0774);
    }
    return dir;
}