Hmm, the more I look at this, the more it's starting to look like the
following Firefox bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=421482

I am seeing loads of fsync() calls when the symptoms occur. @Keepiru,
how about you? I'm using strace at the command line to reveal the
fsync() calls:

    strace -p <pid of Firefox> -e fsync -tT

** Bug watch added: Mozilla Bugzilla #421482
   https://bugzilla.mozilla.org/show_bug.cgi?id=421482

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Firefox lags when scrolling
https://bugs.launchpad.net/bugs/383435
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