manifest.json

{
  "name": "Demo extension name",
  "version": "0.0.1",
  "manifest_version": 2,
  "description": "Demo boilerplate for extension",
  "homepage_url": "http://abc.com",
  "icons": {
    "16": "icons/dec.png",
    "48": "icons/dec.png",
    "128": "icons/dec.png"
  },
  "default_locale": "en",
  "background": {
    "page": "src/bg/background.html",
    "persistent": true
  },
  "browser_action": {
    "default_icon": "icons/dec.png",
    "default_title": "Boilerplate Extension",
    "default_popup": "src/browser_action/browser_action.html"
  },
  "externally_connectable": {
    "matches": ["http://localhost/*"]

  },
  "content_scripts": [
       {
         "matches": ["https://*/*", "http://*/*"],
         "js": ["js/jquery/jquery.min.js","src/content/content_script.js","js/jquery/jquery_number.min.js"],
         "css": ["css/style.css"],
         "run_at": "document_end",
         "match_about_blank": true
       }
     ],
  "permissions": [
    "cookies",
    "http://*/*",
    "https://*/*",
    "storage",
    "tabs"
  ]

}