In Firefox3, the page that there is already to bookmark is not added to bookmark newly (It is possible to duplicate url by D&D/Cut&Paste/Import html file).
And in the "Bookmark All Tabs.." command, the tab having same url is not bookmarked.
And "Bookmark All Tabs.." command stores only one page when there is the same page to plural tabs.
This extension revert these to behavior of Firefox2.
You can change these behavior by an option.
[This extension workaround for following bugs.]
1.Bug 450437 – duplicate URLs dropped when bookmarking all tabs.
2.Bug 451581 – Allow adding duplicate bookmarks with Ctrl-D or Star button. (Partial fix)
3.Bug 451586 – Removing a bookmark using the Star dialog also removes all duplicates (same url).
4.Bug 451589 – Star button only allows you to edit the last modified copy/duplicate of a bookmark .
The awesome bar will NOT match on a bm's "Name" (Title) if its url exists in a more recent bm. So if you are wondering why you are not getting a match, You probably have a duplicate, with a different title, that is more recent.(See Bug 451318 – [meta] Unexpected behavior for bookmarks with the same url (duplicate bookmarks) Comment #1-3 and Bug 451587 – Location bar will not match on a bookmark's title/"name" if its url exists in a more recent duplicate bookmark )
For Firefox beta user: It works with 40b13pre and maybe later, does not work 4.0b12.