Buttercup actually allows you to sync via Dropbox, so you can host your vault file there and let DB do the sync'ing, and Buttercup has clients to allow you access to these sync'ed credentials on all major platforms (including within Chrome+Firefox using an extension). Disclaimer: I'm the author.
Neat! I'll have to look into that now. I'm currently a very happy LastPass user (though not for work, so I actually got by without knowing about the outage). But that does sound like an interesting solution.
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