Examine source code of Gallery View

{
  "manifest_version": 2,
  "name": "Image Gallery",
  "version": "1.0",
  "description": "Collects all images and videos on the active site and displays them in various views",
  "permissions": [
    "activeTab",
    "storage",
    "scripting"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "applications": {
    "gecko": {
      "id": "{f3a716a0-cd1d-4a5d-a158-0265860c3fe6}"
    }
  }
}