[Bug 263435]

[Wproxym]

>harald.dunkel at aixigo.de 2011-06-16 03:26:12 PDT
>
>Sorry, I didn't mean to annoy anybody. But since the File-->Close menu item has >been streamlined away this bug has become even more painful.

You can temporery use variants:
1) close tab by Middle Mouse Click
2) close browser by closing all it widows by x icon (Alt+F4 or other other stadard hotkey of your system)
3) click to Location Bar, then all hotkeys will be ungrabbed.

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https://bugs.launchpad.net/bugs/263435

Title:
  Firefox cannot close tab (using Ctrl-w) when flash content is selected
  on page

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