I did a minor change to your script.
I think the used regex matches too many links.
Any link, which includes the proper node_id=\d+ is highlighted (saw this on the home node of a highlighted user).
Don't know if this is intentional, or not.
As I wanted only to highlight links which direct to home nodes, I tried a fix and changed the regex from /node_id=(\d+)/ to /\?node_id=(\d+)$/:
if ( /\?node_id=(\d+)$/.test(links[i].href) && SaintsBook[RegExp.$1] )
Maybe it's a fix, maybe not.
May it be helpful to others ;)
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