piroor/multipletab — pull request #29 by Infocatcher (2012-08-29 05:51:26+00:00)
Title: Hide "Move to Group" item, if user don't use Panorama

Like built-in context menu item behavior, see chrome://browser/content/browser.js
```javascript
document.getElementById("context_tabViewMenu").hidden =
(this.contextTab.pinned || !TabView.firstUseExperienced);
```