in 4.x, on unix, it looks like we have a pref "browser.bookmark_file" that points to the bookmarks file. in most cases, it is ~/.netscape/bookmarks.html, which is what we assume it to be in the 6.0 profile migration code. But, it is possible for that pref to be set to another file. see http://lxr.mcom.com/nova/search?string=bookmark_file we need to change nsPrefMigration.cpp to use the "browser.bookmark_file pref (on unix) if it is set.
Seth: is this a dupe of bug 31623? Gerv
We decided not to do this, as sharing bookmarks between 4.x and Mozilla isn't a good idea. People can set the new pref, browser.bookmarks.file, if they want to set an alternate bookmarks file in Mozilla. Gerv