consider not put all browser windows to the front?

[hitzhangjie]

I open two browser windows, one is on display 1, the other is on display 2.

I write markdown files in display 1 with vim, and want to preview the markdown in display 2.

After I press :LivedownToggle, I expect the preview page will be shown in browser window of display 2.

Yes, it works indeed. But it also put the browser window of display 1 to the front, which hides the vim window.