browser extension for Google chrome

2012-10-01 update: because of questionable design choices from the developers of Google chrome, the pgn4web project has discontinued the chess games viewer extension. As a result the information below is obsolete and is kept only for historical reasons; more info at the wiki page.

Based on pgn4web, the chess games viewer extension for the Google chrome web browser provides an interactive chessboard showing chess games from links to *.PGN URLs and from PGN text, using context menus and page actions. Live chess broadcasts are supported.
Once you have installed the extension, an icon should appear in the address bar of this page, having recognized this link to chess games in PGN format; hovering the mouse over the link, the mouse pointer icon should highlight the link as chess games; manually right-clicking that link the chess games viewer context menu item should be available; finally, you can select the following PGN text and load the game in the chess viewer using the right-click context menu:
[Event "Wch"]
[Site "Moscow URS"]
[Date "1985.10.15"]
[Round "16"]
[White "Karpov"]
[Black "Kasparov"]
[Result "0-1"]
[Opening "Sicilian"]
[ECO "B44"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nb5 d6 6. c4 Nf6 7. N1c3 a6 8.
Na3 d5 9. cxd5 exd5 10. exd5 Nb4 11. Be2 Bc5 12. O-O O-O 13. Bf3 Bf5 14.
Bg5 Re8 15. Qd2 b5 16. Rad1 Nd3 17. Nab1 h6 18. Bh4 b4 19. Na4 Bd6 20. Bg3
Rc8 21. b3 g5 22. Bxd6 Qxd6 23. g3 Nd7 24. Bg2 Qf6 25. a3 a5 26. axb4 axb4
27. Qa2 Bg6 28. d6 g4 29. Qd2 Kg7 30. f3 Qxd6 31. fxg4 Qd4+ 32. Kh1 Nf6 33.
Rf4 Ne4 34. Qxd3 Nf2+ 35. Rxf2 Bxd3 36. Rfd2 Qe3 37. Rxd3 Rc1 38. Nb2 Qf2
39. Nd2 Rxd1+ 40. Nxd1 Re1+ 0-1