Examine source code of Vocabely: Smart Vocabulary Helper

{
  "manifest_version": 2,
  "name": "Vocabely: Smart Vocabulary Helper",
  "version": "1.2",
  "description": "Vocabely: Translate and save vocabulary from any webpage. Link with the app (Vocabely) for full functionality.",
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": "icons/icon.png"
  },
  "permissions": [
    "activeTab",
    "contextMenus",
    "storage",
    "clipboardRead",
    "<all_urls>",
    "tabs"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'; img-src 'self' http://163.172.127.108 data:;",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>",
        "file:///*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "public/*",
    "popup.html",
    "alert.html",
    "icons/*.png"
  ],
  "commands": {
    "translate_selected_text": {
      "suggested_key": {
        "default": "Alt+C"
      },
      "description": "Translate selected text."
    },
    "add_word_to_vocabely": {
      "suggested_key": {
        "default": "Alt+V"
      },
      "description": "Add selected text/word to Vocabely."
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e1dc2597-f778-4330-9095-d81daddcabd7}"
    }
  }
}