Examine source code of ElementHider

{
  "name": "ElementHider: Hide Content & Spoilers",
  "version": "1.1.8",
  "manifest_version": 3,
  "description": "Automatically hide or blur unwanted text, spoilers, and distracting page elements using your own custom keywords",
  "homepage_url": "https://elementhider.web.app",
  "browser_specific_settings": {
    "gecko": {
      "id": "tsuval@protonmail.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon.png"
  },
  "options_ui": {
    "page": "src/browser_action/KeywordEditor.html"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "src/shared/associationUtils.js",
      "src/shared/keywordUtils.js",
      "bg.js"
    ]
  },
  "host_permissions": [
    "*://*/*"
  ],
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon.png"
    },
    "default_title": "ElementHider",
    "default_popup": "src/browser_action/popup.html"
  },
  "content_scripts": [
    {
      "run_at": "document_start",
      "all_frames": true,
      "matches": [
        "*://*/*"
      ],
      "js": [
        "src/shared/associationUtils.js",
        "src/inject/inject.js"
      ]
    }
  ]
}