Examine source code of Remember-To-Save Value saver

{
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "kira_rts_toolbar_amohosted@offsight.co.uk"
    }
  },
  "browser_action": {
    "default_title": "Remember-to-Save Reminders",
    "default_icon": "icon128.png",
    "default_popup": "about.html"
  },
  "name": "Remember-to-Save Reminders",
  "description": "Saving reminders that informs users that they could save money on targeted websites by using the Remember-to-save service",
  "version": "0.862resigned1",
  "background": {
    "scripts": [
      "api-background.js",
      "js/background.js"
    ]
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [
        "css/toolbar.css"
      ],
      "js": [
        "api.js",
        "js/toolbar.js"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "*://remembertosave.offsight.co.uk/*",
    "*://www.rtsvaluesaver.co.uk/",
    "*://rtsvaluesaver.co.uk/"
  ],
  "icons": {
    "128": "icon128.png"
  }
}