manifest.json

{
  "name": "B.S. Detector",
  "version": "0.2.5",
  "manifest_version": 2,
  "default_locale": "en",
  "description": "Warns users about unreliable news sources.",
  "homepage_url": "https://github.com/lishiyo/bs-detector.git",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "<all_urls>",
    "background" //if you want to inject it from a background page
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ],
    "persistent": true
  },
  "content_scripts": [ {
     "css": [ "css/hint.min.css", "css/inject.css"],
     // "js": [ "js/inject.js" ],
     "matches": [ "*://*/*" ],
     "all_frames": true, // get inside iframes
     "run_at": "document_end" // before window.onload
  } ],
  "web_accessible_resources": [
    "data/data.json",
    "css/inject.css"
  ]
}