Hi guys Recently in firefox nightly, when I am scrolling through web pages I often get a thin white line across the entire window. Fortunately the white line is just within the browser and does not extend past the window - so thinking its a firefox issue. I am using a rMBP - has anyone encountered this recently with firefox nightly? If it helps the version of Nightly I am currently running is 19.0a1. It happens a lot and it is annoying. I love firefox so won't be changing anytime soon! I could have posted this on the firefox forums but wasn't sure if it was rMBP related (and macrumors is the best forum around ). Would appreciate your thoughts..