Determined to fix this, I broke out Firebug, the trusty HTML/CSS inspection plugin for Firefox, and found the offending CSS:
.AnqB9d {Then, I created this little Greasemonkey script:
color:#3F586D;
}
function addGlobalStyle(css) {Viola! Readable mailbox items! Check out before and after shots:
var head, style;
head = document.getElementsByTagName('head')[0];
if (!head) { return; }
style = document.createElement('style');
style.type = 'text/css';
style.innerHTML = css;
head.appendChild(style);
}
addGlobalStyle(
'.AnqB9d {' +
' color: black ! important;' +
'}'
);
Before:

After:

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