…OMG. I’ve been noticing that browsing my Tumblr dash in Firefox uses up around 1/3 of my CPU cycles, even with ad scripts blocked, but couldn’t figure out why.
After reading some developer tools documentation online, I managed to pinpoint that it was something involving CSS animations, but couldn’t find any obvious element that was animating on the page. So then I did a bit more debugging to see what animations were being reported by the document inspector.
It’s the mouseover animation on the Tumblr logo. Which, apparently, is coded in such a way that it keeps animating in the background even when the mouse is nowhere near it (!?!?!?!).
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Don0303 