Examine source code of Post Hider

{
  "manifest_version": 2,
  "name": "Post Hider",
  "version": "1.1",
  "description": "An extension to hide posts on a website with a gray box.",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Post Hider"
  },
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{f1288e98-246f-4865-96b5-3fd54d925517}"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_end"
    }
  ]
}