NewTabFromUrlbar.uc.js

// ==UserScript==
// @name           New tab from Urlbar
// @description    URLバーから新しいタブで開く
// @namespace      5ch
// @include        main
// @license        MIT
// @version        0.0.1
// ==/UserScript==
(() => {
"use strict";
const openInTabService = {
    _oldHandleCommand: null,

    isNewTab: function(url) {
        if (!url)
            return false;

        if (/^moz-action:visiturl,/.test(url)) {
            const json = JSON.parse(url.substring(20));
            url = decodeURIComponent(json.url);
        }

        let isBlank = false;
        let tab = gBrowser.mCurrentTab;
        if (!(tab.hasAttribute("pinned") || tab.hasAttribute("busy") || tab.hasAttribute("pending"))) {
            try {
                if (/^\s*about:(blank|newtab|home)/i.test(gBrowser.mCurrentBrowser.currentURI.spec))
                    isBlank = true;
            } catch (e) {
                isBlank = true;
            }
        }

        return (isBlank || /^\s*(javascript|mailto):/i.test(url))? false: true;
    },

    newHandleCommand: function(event, where, param) {
        if (!where) {
            if (openInTabService.isNewTab(gURLBar.value))
                where = "tab";
        }
        openInTabService._oldHandleCommand.call(gURLBar, event, where, param);
    },

    start: function() {
        if (this._oldHandleCommand == null) {
            this._oldHandleCommand = gURLBar.handleCommand;
            gURLBar.handleCommand = this.newHandleCommand;
        }
    },
};

openInTabService.start();
})();