Examine source code of SaveMore Later

{
  "manifest_version": 3,
  "name": "__MSG_name__",
  "description": "__MSG_description__",
  "version": "1.20.0",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "save-more-later@example.com",
      "strict_min_version": "142.0"
    }
  },
  "permissions": [
    "storage",
    "scripting",
    "alarms",
    "activeTab"
  ],
  "host_permissions": [
    "https://mail.google.com/*",
    "https://outlook.live.com/*",
    "https://outlook.office.com/*",
    "https://outlook.office365.com/*"
  ],
  "action": {
    "default_icon": {
      "16": "assets/icons/icon16.png",
      "32": "assets/icons/icon32.png",
      "48": "assets/icons/icon48.png",
      "128": "assets/icons/icon128.png"
    },
    "default_title": "SaveMore Later",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*",
        "https://outlook.live.com/*",
        "https://outlook.office.com/*",
        "https://outlook.office365.com/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}