Examine source code of Image Control

{
  "author": "igorlogius",
  "homepage_url": "https://github.com/igorlogius/image-control",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {},
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+A"
      }
    },
    "switch-mode": {
      "suggested_key": {
        "default": "Alt+Shift+M"
      }
    }
  },
  "icons": {
    "128": "icon.png"
  },
  "manifest_version": 2,
  "name": "Image Control",
  "options_ui": {
    "page": "popup.html"
  },
  "permissions": [
    "menus",
    "tabs",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "notifications"
  ],
  "version": "1.7.8",
  "browser_specific_settings": {
    "gecko": {
      "id": "{50f3707d-420f-4b4c-aed4-dd3277b4f324}"
    }
  }
}