Question about a11y docs status

Hi all,

I'm working on updating the organization of docs content on MDN, and 
stumbled upon this page:

https://developer.mozilla.org/en-US/docs/AJAX/WAI_ARIA_Live_Regions_API_Support

The "AJAX" section of MDN is getting removed in the next few days, 
since it's almost all repetetive. What's not repetetive will be moved 
elsewhere.

What I'm trying to figure out is whether this page is useful at all, 
and if so, whether it's Firefox-specific material (ie, "here's what 
Firefox supports") or general Web documentation. That will tell me 
where on MDN to move the content to.

If it's not useful at all, then I can archive it so that it can be 
found by people that really do need it but it won't show up to average 
readers.

Can anyone help me figure this out?

Thanks,

-- 
Eric Shepherd
Developer Documentation Lead
Mozilla
Blog: http://www.bitstampede.com/
Twitter: @sheppy