Steam ID Finder for Chrome
More About Steam ID Finder
Simply visit a Steam profile page and instantly copy the player ID that you need!
Also - it's possible to just right-click any player to instantly copy the ID that you need!
You can even visit the Friends Manager page and instantly copy all your friends' IDs in one click!
And for dessert - click the extension icon (top-right corner in LTR languages) to set a flag that will be added for whatever ID that you're copying!
The innovation begins right now!