hi kop48, until windows 10 is still in an early pre-release state right now there might be all sorts of issues since drivers and software are not optimized yet. since there will still be lot of changes, i'm not sure if it would even be helpful to file a firefox bug at this stage...

Actually, now is the perfect time to file bugs - that's the whole point of the Technical Preview!

this might be the case for bugs filed against windows. however as long as the environment is still unstable and constantly changing (that's until windows 10 goes into release preview), it doesn't make sense for mozilla to invest resources to fix "bugs" that might go away anyway as the win10 development progresses further - an example for that would be bug #1089188...

It makes sense for Mozilla to invest some time in an OS that many millions of people will be upgrading to, albeit I can understand having to wait until developer documentation is released so that Firefox devs can troubleshoot effectively. :)

Regardless, I've filed the bug with Microsoft - it might just be an Intel driver problem, as the issue isn't happening on my other machine with an NVidia GPU.