Refused to execute inline script because it violates the following Content Security Policy directive: "script-src 'self' chrome-extension-resource:".
Manifest.json
{ // Required "name": "Sample Extension", "version": "0.2", "manifest_version": 2, "background": { "page": "background.html"}, "browser_action": { "default_icon": "icon.png", "default_popup": "popup.html" } }
Chrome Extensionのmanifestバージョンを上げる(1から2へ) - ike-daiの日記
chrome extension で manifest version 2にするとインラインスクリプトが使えないとのことで。