tabs.duplicate

ext-tabs.js

      duplicate: function(tabId, callback) {
        let tab = TabManager.getTab(tabId);
        // Ignore invalid tab ids.
        if (!tab) {
          if (callback) {
            runSafe(context, callback, undefined);
          }
          return;
        }

        let gBrowser = tab.ownerDocument.defaultView.gBrowser;
        let newTab = gBrowser.duplicateTab(tab);
        gBrowser.moveTabTo(newTab, gBrowser.visibleTabs.indexOf(tab) + 1);
        gBrowser.selectedTab = newTab;
        gBrowser.updateCurrentBrowser(true);

        // to be called if the addon has been disabled before
        // the callback has been called
        let cleanupOnClose = {
          close: () => {
            if (newTab) {
              newTab.removeEventListener("SSTabRestored", onTabRestored);
            }
          },
        };
        
        // to be called once the duplicated tab is fully restored 
        let onTabRestored = () => {
          // no need to cleanup on close anymore
          context.forgetOnClose(cleanupOnClose);
          //remove the one shot listener
          newTab.removeEventListener("SSTabRestored", onTabRestored);

          // these should both log the duplicated URI 
          dump(newTab.linkedBrowser.currentURI.spec)
          dump('\n')
          dump(tab.linkedBrowser.currentURI.spec)
          dump('\n')

          if (callback) {
            runSafe(context, callback, TabManager.convert(extension, newTab));
          }
        };
        // wait the SSTabRestored event
        newTab.addEventListener("SSTabRestored", onTabRestored);
        // prepare to cleanup the registered listener if the addon has been disabled
        context.callOnClose(cleanupOnClose);
      },