Examine source code of Ddict

{
  "name": "Ddict Translate: Translator - Dictionary",
  "description": "Instantly translate sentences and look up words on website. Just by a mouse click or a keypress.",
  "version": "4.4.1",
  "manifest_version": 2,
  "icons": {
    "16": "logo/16.png",
    "48": "logo/48.png",
    "128": "logo/icon.png"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+D"
      }
    },
    "translate": {
      "suggested_key": {
        "default": "Alt+W"
      },
      "description": "Translate"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": true,
      "match_about_blank": true,
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "img/spin.gif",
    "img/audio.png",
    "logo/48.png"
  ],
  "browser_action": {
    "default_title": "Ddict Translate: Translator - Dictionary",
    "default_icon": "logo/icon.png",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "permissions": [
    "notifications",
    "contextMenus",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "*://translate.google.com/*",
    "*://translate.googleapis.com/*",
    "*://*.ddict.me/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "jid1-wC71d7poAZYEGA@jetpack"
    }
  }
}