use currentWindow:true instead of windowId to select current window
use currentWindow:true instead of windowId to select current window

anaran/webextensions-examples,matthewjwein/webextensions-examples,andymckay/webextensions-examples,matthewjwein/webextensions-examples,andymckay/webextensions-examples,evolighting/webextensions-examples,evolighting/webextensions-examples,mdn/webextensions-examples,mdn/webextensions-examples,matthewjwein/webextensions-examples,anaran/webextensions-examples,evolighting/webextensions-examples,mdn/webextensions-examples