STR: 1) Open http://www.omgubuntu.co.uk/ on latest Nightly in Windows. 2) Hover over the OMGUbuntu logo. What happens: The logo rotates and then becomes blurry after your cursor stays on it for sometime. This doesn't happen in Chrome.
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:47.0) Gecko/20100101 Firefox/47.0 Build ID: 20160210071115 I can confirm this is reproducible on the latest Nightly 47, on Windows 10 and Mac OS X 10.10 - the "OMG! Ubuntu!" image becomes blurry.