Disable google search input focus

I'm trying to develop chrome extension to save users favourite urls, so user will click in a button and a popup will appear infront of the website he is visiting allowing him to save his url. The point is when this popup is been shown while user vistiing google.com, user can't write anything in the popup because google's input is automatically in focus so what should I do to disable this behavior?

Note: This is only happening with google.com