Earlier quoted context omitted.
I don't see how the deepest knowledge of Microsoft Windows would help them fight website memory usage issues. Those things are entirely unrelated. However the reported bug is non-trivial, therefore it would be very strange if it would manifest itself identically on different non-related browsers. They might all leak, but I doubt they all leak 1M for 22kb file.
> "non-related browsers" Chrome and Safari both use webkit. Of course that doesn't explain Firefox.
And Opera (which is a "modern browser" too)