Examine source code of Dictionary Tunnel

{
  "manifest_version": 2,
  "name": "Dictionary Tunnel",
  "description": "This addon looks up the entered word in some predefined online dictionaries and fetches the definitions",
  "homepage_url": "https://github.com/PersianBrat/dictionary-tunnel",
  "icons": {
    "64": "my-dictionary-64px.3b062355.png",
    "128": "my-dictionary-128px.4ba354c1.png"
  },
  "version": "0.1.1",
  "browser_action": {
    "default_title": "Dictionary Tunnel",
    "default_icon": "my-dictionary-64px.3b062355.png"
  },
  "sidebar_action": {
    "default_title": "Dictionary Tunnel",
    "default_icon": "my-dictionary-64px.3b062355.png",
    "default_panel": "panel/sidebar.html"
  },
  "background": {
    "scripts": [
      "background.5da96367.js"
    ]
  },
  "commands": {},
  "web_accessible_resources": [
    "panel/sidebar.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{c2fc21d5-2286-4484-9bac-1567abf4dd76}"
    }
  }
}