add custom action in Iceweasel context menu?

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http://crunchbang.org – john@box:/data/john/downloads$ unrar e 347a.jpg UNRAR 3.93 freeware Copyright (c) 1993-2010 Alexander Roshal 347a.jpg is not RAR archive No files to extractI'm eager to find out what this is all about...Meanwhile, there's the Open With extension. I use it to open media files in my mplayer wrapper script, so it might well do what you want. (HowTos)