Nightly updates for Firefox on Tablets
Nick Thomas 
Development continues apace on the native rewrite of Firefox for Android, with the emphasis being on smartphones for the moment. In the meantime the XUL-based builds are recommended for tablets, and from a few days ago they started updating to the next XUL nightly (instead of swapping back to the native one).
The current links for the development channels are Nightly and Aurora. Give them a spin and help us test these builds on your tablet!
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So the XUL version is still being worked on? This is not very clear
As I understand it, the XUL version is in maintenance mode for now.