FireFox serious problem

[John Dangler]

I'm not sure why, but as of today, I can no longer bookmark any pages
nor download files in FF.
When selecting either of these functions, I get an error dialog that
says - 
(For Bookmarks)
"XML Parsing Error: not well-formed
Location: chrome://browser/content/bookmarks/addBookmark2.xul
Line Number 1, Column 7:

	</tree>
---------^

(for downloads)
"XML Parsing Error: not well-formed
Location: chrome://mozapps/content/downloads/downloads.xul
Line Number 1, Column 13:
ompter.alert(window, title, text);
-------------^

Anyone else seen this?


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