Popup window per Ett Chung

Move tab to standalone window, without tabs bar, navigation bar and bookmark bar UI.

Usage:
1. Right click on link, click [Open this link in pop-up window] => po-pup link to standalone window.
2. Right click on page, click [Move current page to pop-up window] => move current page to standalone window.
3. Click on toolbar button => move current page to standalone window.
4. More preferences in add-on setting page.