It looks like bug 1240357 is for SVGImageElement, and it's unrelated to this bug. The fix for bug 1240357 won't fix the issue in [`imgIRequest::hadCrossOriginRedirects`](https://searchfox.org/mozilla-central/rev/31368c7795f44b7a15531d6c5e52dc97f82cf2d5/image/imgIRequest.idl#127) (The getter is implemented [here](https://searchfox.org/mozilla-central/rev/31368c7795f44b7a15531d6c5e52dc97f82cf2d5/image/imgRequestProxy.cpp#907)).
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It looks like bug 1240357 is for SVGImageElement, and it's irrelevant to this bug. The fix for bug 1240357 won't fix the issue in [`imgIRequest::hadCrossOriginRedirects`](https://searchfox.org/mozilla-central/rev/31368c7795f44b7a15531d6c5e52dc97f82cf2d5/image/imgIRequest.idl#127) (The getter is implemented [here](https://searchfox.org/mozilla-central/rev/31368c7795f44b7a15531d6c5e52dc97f82cf2d5/image/imgRequestProxy.cpp#907)).