Mozilla Weave is an add-on for Mozilla products that can sync data between multiple installations. Weave can for instance be used by Firefox users to synchronize bookmarks, passwords, filled forms, preferences or the web browsing history between multiple computer systems running the web browser with the Weave add-on installed.
The basic Weave client uses Mozilla web servers to store the encrypted information so that all Weave installations can access the data regardless of the states of the other computer systems running Weave.

Weave users need to create an account – or more than one – that needs to be used on all computer systems to authorize the computer system so that the data can be transferred.
The data that gets synchronized this way can be selected in the the options which can be interesting for users who might prefer not to sync the open tabs or the browsing history.
A Weave server was released as well which can be used by companies to implement Weave on their servers so that no third party servers like the Mozilla Weave servers are used for data storage and transfers.
Mobile users can look forward to Weave 1.0 being released tomorrow for Maemo with the likelihood that support for other devices is expanded in the near future once the Firefox mobile developers start supporting those devices in upcoming releases.
Weave can be downloaded from the Mozilla website. The add-on is compatible with all Firefox 3.5 to 3.7x versions.
Update: Mozilla Weave the add-on is no longer available. Mozilla has however integrated its synchronization functionality natively into the Firefox web browser. Firefox users who want to sync data between different computer systems can now open the Options and switch to the Sync tab there to configure the feature. It is necessary to create an account though as data is currently synced using Mozilla servers.
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I have been hoping for this 1.0 release for a long time. I have been a happy consumer of xmarks/foxmarks, for awhile now.
I have a couple of questions before I go for this:
1) how well does it work syncing between Linux and Windows installations? I am thinking that this is probably a non-issue, but I would like confirmation.
2) Can I select different bookmark folders to be excluded for syncing at work computers? Some things are better not being on work computers…
2) Can I select different bookmark folders to be excluded for syncing at work computers? Some things are better not being on work computers…
+1 to this question. My bookmarks is very different for home and office, I wont to sync only some of folders.
So I went ahead and in stalled Weave. I think that it is useful, but the lack of profiles for accounts does hurt.
To answer my own question for others:
1) Not sure yet. I have used it for 3 days now, and I have not seen a problem with it.
2) No. I am currently still using Xmarks to sync my bookmarks.