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I understood that some of the functionality
(subroutines/modules/whatever) did not comply with the Debian
philosophy, and so were removed, to make the resultant applications
compliant with the Debian philosophy.
Mozilla Corp. (as opposed to Mozilla Foundation) took offence at:-
* Debian backporting security fixes to older versions of
Firefox/Iceweasel
* *at Debian allowing users to change search engines and make other
modifications*
, and insisted the use of the Firefox name is permitted only if
accompanied by its logo, icons, and other artwork (which is in breach of
the Debian Free Software Guidlines).
Long story short, icons, artwork, logo, and icons changed in the Debian
version (Icecat is another story).
So - reduced funtionality in Iceweasel - emphatically no. In fact
Iceweasel has more functionality than Firefox.
Feel free to look it up for yourself - the references are on this page
http://en.wikipedia.org/wiki/Iceweasel
Cheers