network channel priorities

Bradford Lassey blassey at
Tue Jan 14 11:21:08 PST 2014

Jason Duel called out in the platform engineering meeting that we have 
the ability (and should use it) to set priorities on channels. 
Specifically he called out bug 802573, where loading favicons was 
getting in the way of loading pages, but suggested it be used anywhere 
where we're loading something over the network that the user isn't 
specifically waiting for.

Code for setting it looks like this:


where priorityChannel is an instance of nsISupportsPriority.

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