Why not parse each timeline item to determine the originator? If the originator's name (or some other attribute) matches that of someone on the user's friend li

Why not parse each timeline item to determine the originator? If the originator's name (or some other attribute) matches that of someone on the user's friend list, show the content; otherwise, don't. Using the official Facebook API, doing this is very much possible in a custom client. To do in with a browser addon, you may not always have access to internal user IDs, but can still fall back to imperfect name comparisons, which should still give decent results.