We use <canvas>.toBlob() to compress the snapshots to PNG. I ran a few experiments with JPG, but the results seemed to even out between PNG and JPG (with 100% quality). Choosing a lower quality for JPG compression quickly started to look bad, especially on retina displays. Comment 176 had a few details around this:
https://bugzilla.mozilla.org/show_bug.cgi?id=678392#c176

-Stephen

-------- Original Message --------
Subject: Re: Increase in memory utilization on Mac OSX 10.7+ due to history swipe animations
From: Robert O'Callahan <[email protected]>
To: Stephen Pohl <[email protected]>
Cc: [email protected]
Date: 2/12/13 4:44 PM
Can we compress these screenshots to JPEG or something?

Rob
--
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