We add it immediately after the page finishes loading (hooking into 
nsBrowserStatusHandler.prototype.endDocumentLoad).

To my knowledge, we don't do any investigation of the style data after 
that.  The pseudo-class selectors are already there (due to our CSS hacks).

Boris Zbarsky wrote:
> Alex Vincent wrote:
>> The patch in question affects code which fires when a CSS stylesheet 
>> is either added or removed from the document.  Our code triggers this 
>> by adding the stylesheet.
> 
> How are you adding it, exactly?  At what point in time are you adding 
> it?  Are you then looking at style data?  If so, how are you looking at it?
> 
> -Boris
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