If you'd like to know how well other traders are doing for the day, Nosy can help. In the forums, reading inner messages, you can hover over a poster's name, and a tooltip will appear, providing the poster's port rank, value, and gain or loss for the day. On watchlists, leagues and leaderboards, there is a clickable ? beside each player name, which provides the same information in a pop-up.
You could work out player gain or loss for the day yourself, by opening their profile, and whatever lifetime leaderboard page they appear on, and subtracting their previous day's net worth (leaderboard) from their active net worth (profile). Nosy just makes it easy to be nosy. Keep in mind that Nosy is opening 2 web pages in the background, and can only work as fast as the Interwebs, and your connection. Nosy works with Firefox-Greasemonkey, and with Chrome.
Nosy now allows you to keep tabs on the current performance of your best frienemies on HSX. Their gain or loss for the day will show up in the announcement bar of every page viewed, excluding portfolio and profile pages, and trade confirmations. Click the ? to set up the user IDs. While data for a maximum of 3 users can be retrieved and displayed at one time, you can enter as many as you want; the display will cycle on successive page loads. Note that spelling is critical, just as when adding someone to your HSX Watchlist. You can change back to the normal announcement view at any time, by clicking the ?. We're still opening 2 pages per user displayed, in the background. This will cause some extra server load, as well as more ads served by HSX. Depending on feedback, we may end up having to keep the frienemy display off most of the time. There's no apparent drag on your page loading performance, BTW; the data just pops in when available, after the page is displayed. Note: the frienemy feature depends on HSX showing the Announcement Bar at page top, which it used to have on, permanently. Now, not so much.