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diff --git a/skins/common/diff.js b/skins/common/diff.js
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+/*
+Workaround for overflow bug in Mozilla 1.1 and earlier, where scrolling
+<div>s in <td> cells collapse their height to a single line.
+
+Known to be fixed in 1.2.1 (Gecko 20021130), but the CSS hacks I've tried
+with overflow-x disable the scrolling all the way until Mozilla 1.8 / FF 1.5
+and break Opera as well.
+
+So... we check for reaaaally old Gecko and hack in an alternate rule to let
+the wide cells spill instead of scrolling them. Not ideal as it won't work
+if JS is disabled, of course.
+*/
+
+if (navigator && navigator.product == "Gecko" && navigator.productSub < "20021130") {
+	var sheets = document.styleSheets;
+	var lastSheet = sheets[sheets.length-1];
+	lastSheet.insertRule(
+		"table.diff td div { overflow: visible; }",
+		lastSheet.cssRules.length);
+}