User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0 (Beta/Release) Build ID: 20140718030202 Steps to reproduce: I installed Firefox Nightly on my system: i5-2500K, ASRock Z77 Extreme IV, dual R9 270X Graphics cards and 16 GB RAM. Then I left it open on the default launch screen over night. Actual results: I woke up to the sound of my second GPU's fans roaring and temps floating around 130 F. When I closed Nightly, it immediately cooled down to normal and went back to silent. Expected results: My graphics card should have been virtually unused.
Component: Untriaged → Graphics
Product: Firefox → Core
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