Examine source code of SmartUpscale

{
  "manifest_version": 2,
  "name": "SmartUpscale",
  "description": "__MSG_addon_description__",
  "version": "1.4.1",
  "author": "Marat Tanalin",
  "homepage_url": "__MSG_addon_url__",
  "default_locale": "en",
  "icons": {
    "48": "icons/48.png",
    "64": "icons/64.png",
    "128": "icons/128.png"
  },
  "applications": {
    "gecko": {
      "id": "smart-upscale@tanalin.com",
      "strict_min_version": "56.0"
    }
  },
  "background": {
    "scripts": [
      "utils.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "utils.js",
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "options_ui": {
    "page": "options.htm",
    "browser_style": false
  },
  "permissions": [
    "storage"
  ]
}