There appears to be a general problem with Firefox rendering Adobe Flash content when running on an MS Surface Pro 4 with Windows 10 64. While general page content renders correctly, Adobe Flash content renders at a much reduced size. The most simple way to view this problem is to compare how the Adobe Test Page http://www.adobe.com/uk/software/flash/about/ renders in Firefox and compare with the same page displayed on the MS Edge browser. On other platforms Flash content renders at the same scale. This problem appears to be specific to Firefox and Adobe Flash on a Surface Pro 4 and is most likely something to do with the interaction between Firefox and the display driver on this platform. The short-term work around is to increase the page magnification of the affected page but this does not always work well due to the different scales between the static page content and Flash elements. Would be good to find a fix for this problem in future updates.