is there a way to view all Firefox bookmarks at once without the folder structure
Is this what you're looking for?
In Firefox, open Bookmarks from the menu bar and select Organize Bookmarks. In the resulting window, select Import and Backup, then Export HTML .... Save the file bookmarks.html to a convenient location, such as your desktop. Finally, double-click on bookmarks.html to open a nicely formatted list of your bookmarks.
(These instructions work in Firefox 3.6.6. Might be different in other versions.)
HTH
Petek