Examine source code of Word Hider

{
  "manifest_version": 2,
  "name": "Word Blocker",
  "version": "1.6",
  "description": "Hide and reveal selected words on web pages.",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Word Blocker"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y",
        "mac": "MacCtrl+Shift+Y"
      },
      "description": "Open Word Blocker popup"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1fd0af31-c55d-49c7-ae2b-46c418a303d2}"
    }
  }
}