I spent one hour trying to find how in Debian one of the following packaged named

You're using the wrong tools: 

$ apt-cache search gtkmozembed
libgecko2.0-cil - CLI binding for the GtkMozEmbed library, unstable ve
+rsion
libgtk-mozembed-ruby - ruby binding of GtkMozEmbed, gecko renderer
libxul-common - Gecko engine library - common files
libxul-dev - Development files for the Gecko engine library
libxul0d - Gecko engine library
libxul0d-dbg - Development files for the Gecko engine library

[download]

My guess is that it's the libxul-dev package, but you have to try that out by yourself.

Btw a usefull links is packges.debian.org, you can search for package contents there.

In reply to Re^5: [OT] Problem installing Mozilla::Mechanize by moritz
in thread [OT] Problem installing Mozilla::Mechanize by Gangabass

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