This was weird. I checked Doonesbury a minute ago, and instead of Doonesbury, it was the current Boondocks strip. Everything about the page was Doonesbury, except the actual strip itself, which was Boondocks. I reloaded the page several times. The fourth reload (that’s right, I reloaded it four times—I couldn’t believe my eyes) the correct strip loaded in.
I have both strips bookmarked, so I’m assuming it was a Firefox thing. Never had that one before, though.