+++ This bug was initially created as a clone of Bug #1475524 +++ Not so simple fix. Call to imgTools.decodeImage in WindowsPreviewPerTab.jsm needs to be replaced with imgTools.decodeImageAsync and the callback used/called when the image data has been decoded. My previous fix only renamed the function. Wonder if I tested it but probably not because 2.56 and up was broken at the time... Verfied broken in now fixed 2.57 too.
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+++ This bug was initially created as a clone of Bug #1475524 +++ Not so simple fix. Call to imgTools.decodeImage in WindowsPreviewPerTab.jsm needs to be replaced with imgTools.decodeImageAsync and the callback used/called when the image data has been decoded. My previous fix only renamed the function. Wonder if I tested it but probably not because 2.56 and up was broken at the time... Verfied broken in current working 2.57 too.