Having skimmed through this Mozilla newsgroup thread, I'm perturbed anew about the new Firefox 2.0 misfeature with regard to RSS feeds and client-side XSL. My original grief was that it cost me a significant bit of pointless debugging time even discovering that it was a brand new gotcha. But, the "we know what's good for you" sentiment is clear - I feel like posting any newsgroup responses would be just more time wasted. At least shoving an arbitrary 512 bytes into the feed fixes the bug. (This seems to compress well: "AAAAAAAAAAAA ... AAAAAAAAAARGH!")
Brilliant: I'll just add that to the body of obscure CSS hacks and bug workarounds that'll someday make me give up web development for raising sheep. Thanks a million, guys.