Examine source code of Street View Tracker

{
  "manifest_version": 2,
  "name": "Street View Tracker",
  "version": "1.2",
  "description": "Save coordinates from Google Street View.",
  "permissions": [
    "tabs",
    "storage",
    "https://www.google.com/*"
  ],
  "browser_action": {
    "default_title": "Mapper Visualiser",
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icon.png"
  },
  "applications": {
    "gecko": {
      "id": "streetview-tracker-public@example.com"
    }
  },
  "web_accessible_resources": [
    "viewer.html",
    "viewer.js",
    "leaflet.*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.google.com/*maps*"
      ],
      "js": [
        "inject.js"
      ]
    }
  ]
}