[Greasemonkey] add prefetch attributes

[Nikolas Coukouma]

Leo Zelevinsky wrote:

>Wow, Live HTTP Headers is great (and I found out that every time I
>start my browser, it refreshes my live bookmarks which I didn't even
>remember I had - so bonus).
>
>OK, here's my findings so far:
>Using GM_xml...
>seems to work as far as going to retrieve the page, but doesn't seem
>to speed up the actual "continue" click - could "Pragma: no-cache"
>have something to do with it?
>  
>
If it's set, that would prevent caching. This is part of the HTTP spec.

>changing rel="prefetch" on the links doesn't seem to do anything, as
>we suspected.
>
>Thanks everyone for your help - awesome stuff.
>  
>
-Nikolas Coukouma