Please consider making the browser regain focus, after you:
1)Open a new tab
2)Copy a URL from the address bar
3)When the download window appears on the right corner.
I tend to use CTRL+PageUp, CTRL+PageDown primarily to move left-right on the tabs, and it is a little bit irritating to have to click without an obvious reason, anywhere on the page after those functions, for the browser to regain focus and the keyboard shortcuts to be usable again.
Also if you are playing a YouTube video and a program, like μTorrent for example, is running on the taskbar system tray but is closed as a tab, and you click on the tray icon for the program to appear and close it again, the browser never regains focus and shows a black screen after that, due to the Chromium feature to save resources. But then you have to click somewhere on the browser, for it to start showing video picture again. Thank you.