function waitForElm(selector) {
    return new Promise(resolve => {
        if (document.querySelector(selector)) {
            return resolve(document.querySelector(selector));
        }

        const observer = new MutationObserver(mutations => {
            if (document.querySelector(selector)) {
                resolve(document.querySelector(selector));
                observer.disconnect();
            }
        });

        observer.observe(document.body, {
            childList: true,
            subtree: true
        });
    });
}

waitForElm('#find-button').then((elm) => {
	var find = document.querySelector("#find-button label.toolbarbutton-text");
	find.setAttribute("value", "Search");
});

setTimeout(function () {
	waitForElm('#nav-bar').then((elm) => {
		var library = document.querySelector("#bookmarks-menu-button label.toolbarbutton-text");
		library.setAttribute("value", "Favorites");
	});
}, 0);

waitForElm('#bookmarksMenu').then((elm) => {
	var bookmarksmenu = document.querySelector("#bookmarksMenu label.menubar-text");
	bookmarksmenu.setAttribute("value", "Favorites");
	bookmarksmenu.setAttribute("accesskey", "a");
});

waitForElm('#bookmarksMenu').then((elm) => {
	var bookmarksmenu = document.querySelector("#bookmarksMenu");
	bookmarksmenu.setAttribute("accesskey", "a");
});