Hi,

thanks for your suggestion. I total agree with you, the flash is really annoying when opening new tab.

Actually I could disable the animation. But due to limited add-on API, the default background color will still be white. Which means when opening a new tab, you might still see a flash white. We are currently not allow to dynamically modify the new tab page.

Once we are able to dynamically modify the new tab page, I would immediately fix this uncomfortable behavior.