To set a bookmark for the visited file at point:

C-x r m <RET>

To set a named bookmark at point:

C-x r m BOOKMARK <RET>

To open and move to a bookmarked location:

C-x r b BOOKMARK <RET>

To list all bookmarks:

C-x r l

You can use RSS feeds to create live bookmark menus in Firefox. Using the menus, go to Bookmarks -> Manage Bookmarks -> File -> New Live Bookmark. Enter RSS feed information. In your bookmarks menu you'll have a directory-like listing of the RSS information.