I’m following most web sites with Google Reader these days. With some sites I’ve noticed that images don’t show up in the reader interface. I figured this would be because the site is attempting to protect against hot-linking to its resources — and it seems I was right.
The quick fix with Firefox is to disable sending referer-information for inlined images. You can do this in about:config by changing the value of network.http.sendRefererHeader to 1.
While there, I also changed network.http.sendSecureXSiteReferrer to false. This prevents referer-information from being sent between different secure sites.