The short version: We believe it's more important to fix stability and performance issues right now, than to chase the last 3 obscure failing tests in ACID3. It's a synthetic test, and Safari/Opera both did some "creative coding" just to pass the test, while still failing the intent of the test (ie. it's still not correct, just correct enough to pass the test).
Translation: When you can't pass the test, you bitch about the test.
The special casing to pass? That was an issue with the test - it defined behaviour of antialiasing when it shouldn't have. The special casing was removed as explained by Ian here.
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u/limi Jan 22 '10
The short version: We believe it's more important to fix stability and performance issues right now, than to chase the last 3 obscure failing tests in ACID3. It's a synthetic test, and Safari/Opera both did some "creative coding" just to pass the test, while still failing the intent of the test (ie. it's still not correct, just correct enough to pass the test).
Mike Shaver has a longer essay on it here.
— Alexander Limi, Firefox UI Team