Examine source code of View Image Resurrected

{
  "description": "__MSG_extensionDescription__",
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.9.8resigned1",
  "permissions": [
    "webRequest",
    "<all_urls>",
    "storage",
    "downloads",
    "clipboardWrite",
    "notifications"
  ],
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "applications": {
    "gecko": {
      "strict_min_version": "51.0a1",
      "id": "{aad28606-44f7-4681-a654-684b78783f51}"
    }
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "web_accessible_resources": [
    "icons/icon-96.png"
  ],
  "content_scripts": [
    {
      "run_at": "document_end",
      "js": [
        "js/content-script.js"
      ],
      "css": [
        "css/style.css"
      ],
      "matches": [
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      ]
    }
  ]
}