User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20051007 Debian/1.7.12-1 StumbleUpon/1.9995 Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20051007 Debian/1.7.12-1 StumbleUpon/1.9995 When a popup window opens that hides the menu bar, the tab bar is also hidden. However, you can hit Ctrl-T to open a new (invisible, unnavigatable) tab. Hitting Ctrl-W to close the current tab produces an Alert that states: [See bug 60513] "[Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIDOMXULElement.boxObject]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: chrome://global/content/bindings/browser.xml :: get_docShell :: line 0" data: no] Reproducible: Always Steps to Reproduce: 1. Find any site that opens a popup with the menu bar hidden 2. Hit Ctrl-T 3. Hit Ctrl-W

Could you please test this with a current SeaMonkey build?

Resolving INCOMPLETE for lack of an answer (after over two years) to comment #1