FF has an high power usage on alipay as seen on the URL.

Yet another invisible spinning wheel activating the refresh driver.

I was pretty sure we have an existing bug on this, but I can't find it...

Maybe you had in mind Bug 962594?

No, I was thinking about animated gifs specifically. I could also just be misremembering!

Hmm, looking at the code in nsImageLoadingContent I'm not sure how an animated image that never has a frame can get registered with the refresh driver.

(In reply to Timothy Nikkel (:tn) from comment #5) > Hmm, looking at the code in nsImageLoadingContent I'm not sure how an > animated image that never has a frame can get registered with the refresh > driver. After retrying with a clean profile with the latest Nightly the refresh driver doesn't get activated. Either this bug got fixed after the current release or something in my configuration skewed the power metrics.

Okay, thanks for re-testing. It's possible if maybe the same image was used in the same session (when it did get a frame) that maybe it didn't unhooked from the refresh driver? Toggling from display: something to display: none perhaps? Although that should work properly given the current code.

It seems that the real issue on that website comes from a covered background gif. The spinning wheel in the display:none subtree doesn't activate the refresh driver by itself. I am not quite sure how it did in the first place, I will keep digging.