>>341
(function () {
try {
ChromeUtils.importESModule("resource:///modules/CustomizableUI.sys.mjs");
CustomizableUI.createWidget({
id: 'fp-youtube',
type: 'custom',
defaultArea: CustomizableUI.AREA_NAVBAR,
onBuild: function(aDocument) {
const btn = aDocument.createXULElement('toolbarbutton');
btn.id = "fp-youtube";
btn.setAttribute("class", "toolbarbutton-1 chromeclass-toolbar-additional");
btn.setAttribute("label", "YouTube");
btn.setAttribute("tooltiptext", "YouTubeを開きます");
btn.style.listStyleImage = 'url("https://www.youtube.com/yts/img/favicon-vfl8qSV2F.ico";)';
btn.addEventListener('command', () => aDocument.defaultView.openTrustedLinkIn('https://www.youtube.com', 'tab'));
return btn;
}
});
} catch(e) {
ChromeUtils.reportError(e);
};
})();