Examine source code of よむ

{
  "manifest_version": 3,
  "name": "よむ",
  "description": "Japanese popup dictionary, furigana, pitch accent, OCR, subtitles, and a study page.",
  "version": "1.8.2",
  "author": "Henry Russell",
  "homepage_url": "https://yomureader.com/",
  "icons": {
    "16": "newtab/icons/icon16.png",
    "32": "newtab/icons/icon32.png",
    "48": "newtab/icons/icon48.png",
    "128": "newtab/icons/icon128.png"
  },
  "permissions": [
    "activeTab",
    "menus",
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_title": "よむ",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "newtab/icons/icon16.png",
      "32": "newtab/icons/icon32.png",
      "48": "newtab/icons/icon48.png",
      "128": "newtab/icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*",
        "file:///*"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "yomu@yomureader.com",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ],
        "optional": [
          "authenticationInfo"
        ]
      },
      "strict_min_version": "140.0"
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "yomu.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}