function applyScriptToTabHead(tab, source, callback) {
    var isInterrupted = false;

    var code = `
            (() => {
                if(document.head) {
                    var i = document.createElement("script");
                    i.innerHTML = decodeURI(\"${encodeURI(source)}\");
                    document.head.appendChild(i);
                }
                return !!document.head;
            })();
            `;
    var loop = () => {
        chrome.tabs.executeScript(tab.id, {
            code: code,
            runAt: "document_start"
        }, function(args) {
            if (isInterrupted) {
                return;
            }
            if (!args[0]) {
                setTimeout(loop, 1);
            } else {
                callback();
            }
        });
    };
    loop();

    return {
        tab: tab,
        disable: () => {
            isInterrupted = true;
        }
    };
}