Yes, it's a long standing bug...
It has to do with the fact that Firefox changed the way it stores bookmarks. Bookmarks.html is no longer used.
There is a compatibility layer, but it hasn't worked properly when i tried to set the appropriate settings into the firefox profile that's generated when it starts.... What needs to happen is we need someone to write code that can read/write the bookmarks store in the sqlite form, and to integrate this into the General_Info_PlugIn.
Please, help here would be much appreciated, as I am swamped.