Examine source code of WebFeed-Indicator

{
  "manifest_version": 3,
  "name": "WebFeed-Indicator",
  "version": "1.3",
  "description": "Indicates RSS, Atom, and JSON Feeds on Websites.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{bbfa7e83-1d8b-4cfe-b511-f6048d2aa007}"
    }
  },
  "page_action": {
    "default_title": "Show WebFeeds",
    "default_popup": "popup/index.html",
    "browser_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}