To my knowledge Firefox has had support for IndexedDB for a long time without a vendor-prefix. Why does the page claim that it doesn't? Is there a bug in the implementation? A missing feature?
(BLK author here)
Whoops - the public server I had running must have died. I'll get it running again tonight.
If anyone wants their server listed just let me know! I have some directions on the site for how to get it in the listing on the page.