I changed it so that visited links are no longer in a different color. Instead, you can "star" any addresses that you want to track and they will be highlighted if they appear in the payout queue for all future visits. Note, the addresses you care about are stored only in a cookie and so this setting is per-browser. If you use multiple browsers/computers, you'll need to star your favorited addresses once on each of your browsers/computers.
Well, instead of using cookies, I'd have used LocalStorage (since cookies are sent to the server at every request, which is useless in this case because everything is client-side JS).
Also, I see no license header or notice to indicate under which license the code is. Would you care to specify that? Other than that, great tool!