Lifehacker reports that Google Browser Sync has been discontinued and will not be updated to support firefox 3. That is so lame. It is my favorite Firefox plug in, and has completely changed how I use a browser. I have it installed on all my computers for syncing bookmarks and open tabs. Thanks Google.
You're welcome.
I heard that they were going to build bookmark syncing into Firefox itself, but I'm not sure when.
Anyways, you can now get the source for Browser Sync, build your own sync server with python and AppEngine using protocol buffers as the data interchange format.
Looks like a typical starter project if you got hired at Google.