Bookmark menu at the left edge of browser window

[whileloop]

If CentBrowser is the active window, pressing ALT or clicking anywhere in CentBrowser will dismiss the bookmark popup menu.

If CentBrowser is NOT the active window, pressing ALT will activate the menu of the active window (any other program). The popup menu of the active window will be the new topmost on top of the bookmark popup menu. But the bookmark popup menu still remain and block the active window.