[imp] imp 6.1.3 and firefox 22

[Brent]

If you receive an .html-formatted email, you can't do a control-c to  
copy text when in preview pane mode.  Well, you can hit "control-c",  
but it doesn't copy anything into the buffer.  Two workarounds:

1)  Double-click the entire message.  control-c works when detached
2)  Highlight the text, then right-click and choose copy

This does work in chrome, but not Firefox 22.

brent