Siehe hier.
Mal testen bitte:
JavaScript
// buttonCloseTab.uc.js - Button > Firefox Tabs schliessen
(function() {
if (!window.gBrowser) return;
try {
CustomizableUI.createWidget({
id: 'fp-closetabs',
type: 'custom',
defaultArea: CustomizableUI.AREA_NAVBAR,
onBuild: function(aDocument) {
var toolbaritem = aDocument.createElementNS('http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul', 'toolbarbutton');
var props = {
id: 'fp-closetabs',
class: 'toolbarbutton-1 chromeclass-toolbar-additional',
label: 'Aktuellen Tab schließen',
tooltiptext: 'Aktuellen Tab schließen',
style: 'list-style-image: url(\'data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg" color="dodgerblue" width="12" height="12" viewBox="0 0 16 16"><path fill="currentColor" fill-opacity="context-fill-opacity" d="M9.414 8l5.293-5.293a1 1 0 0 0-1.414-1.414L8 6.586 2.707 1.293a1 1 0 0 0-1.414 1.414L6.586 8l-5.293 5.293a1 1 0 1 0 1.414 1.414L8 9.414l5.293 5.293a1 1 0 0 0 1.414-1.414z"></path></svg>\')',
// onclick: 'if (event.button == 0) { \
// BrowserCommands.closeTabOrWindow();\
// }; '
};
for (var p in props)
toolbaritem.setAttribute(p, props[p]);
//toolbaritem.addEventListener('click', event => {
//if (event.button == 0) {
// BrowserCommands.closeTabOrWindow();
// };
//});
return toolbaritem;
}
});
} catch(e) { };
// Fix #2
document.getElementById('fp-closetabs').addEventListener('click', event => {
if (event.button === 0) {
BrowserCommands.closeTabOrWindow();
}
});
})();
