[Conkeror] how can I unfocus from a flash?

[高源]

When I was playing a flash game in a website, all the key-bindings
are disabled. The only thing I can control was the flash itself. I had to
click the blank space of the page with the mouse to unfocus from
the flash, which was quit uncomfortable since I'd already been very
lazy to use the mouse any more. Is there any way to make it?
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