Get the Alpha
Tabcandy is now available as a Firefox build. Get the build for your operating system and give it a try.
There is an old unmaintained extension that works in Minefield.
Report a Bug
If you find one, report it.
Feedback and Ideas
Submit an idea, criticism, or piece of feedback with UserVoice
The lauded HG repository.
Note that this is a quick-n-dirty introductory screencast. Nothing final here; much has changed since this was recorded.
TabCandy is a feature we've been exploring for Firefox on how to handle the modern web workflow by being able to name and group tabs into work spaces. Think Exposé meets Spaces done right. It's an attempt to solve many of the problems we've seen emerge over the last number of years around multitasking and information proliferation. The reason why TabCandy was listed in grey in the product plan is that there are still some some implementation challenges to be solved and a couple user experience questions to be answered for us to be able to commit to TabCandy being in Firefox 4.