Examine source code of Get Image Info

{
  "name": "Get Image Info",
  "description": "View all images on a page and expose image properties, EXIF data, and one-click download. Exposed via the right-click context menu.",
  "version": "1.5.0",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "scripts/jquery/jquery.js",
      "scripts/pixastic/pixastic.core.js",
      "scripts/pixastic/pixastic.actions.histogram.js",
      "scripts/pixastic/pixastic.actions.colorhistogram.js",
      "scripts/pixastic/pixastic.jquery.js",
      "scripts/background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "@getimageinfo",
      "strict_min_version": "57.0"
    }
  },
  "icons": {
    "16": "images/icons/16.png",
    "48": "images/icons/48.png",
    "128": "images/icons/128.png"
  },
  "permissions": [
    "tabs",
    "http://*/",
    "https://*/",
    "activeTab",
    "contextMenus"
  ],
  "content_scripts": [
    {
      "run_at": "document_idle",
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [
        "css/inject.css"
      ],
      "js": [
        "scripts/jquery/jquery.js",
        "scripts/exif/exif.js",
        "scripts/fraction/fraction.js",
        "scripts/inject.js"
      ],
      "all_frames": false
    }
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'"
}