SyncPlaces is a Firefox/SeaMonkey extension that allows you to synchronize your bookmarks and passwords between different installations of Firefox/SeaMonkey (e.g. Home and Work). It only works with Firefox v3//SeaMonkey v2.1 and above but is compatible with older bookmark extensions. It requires your own (or a 3rd party) Web or FTP server which is used to store the bookmarks/passwords centrally.
SortPlaces is a Firefox/SeaMonkey extension that allows you to sort your bookmarks. It only works with Firefox v3/SeaMonkey v2.1 and above, using the new Places API. This plugs a huge gap in Firefox and SeaMonkey which don't have any decent bookmark sorting facility at all. It is also designed to work seamlessly with SyncPlaces.
CheckPlaces is a Firefox/SeaMonkey extension that allows you to check your bookmarks. It only works with Firefox v3/SeaMonkey v2.1 and above, using the new Places API.
It checks that your bookmark URIs are valid and can optionally check if the pages still exist, if there are any duplicate bookmarks, and if you have any empty folders. You can also use it to restore favicons that have gone missing.
SearchPlaces is a Firefox/SeaMonkey extension that allows you to create and edit the bookmark queries introduced in Firefox v3, using the new Places API.
Although Firefox comes with a few basic queries, and you can create basic ones using the Bookmarks Organiser, these can't be edited and there is no way of using the many query options available. SearchPlaces fills this gap allowing you full access to all the options to create queries tailored to your requirements or amend existing ones.