Examine source code of Opinionated

{
  "manifest_version": 2,
  "name": "Opinionated",
  "author": "William Johnston",
  "version": "1.7.0",
  "description": "Checks page content for links to opinion articles on popular news sites",
  "homepage_url": "https://github.com/wjohnsto/opinionated",
  "browser_specific_settings": {
    "gecko": {
      "id": "{aa139ca1-2695-44d7-bf0d-78d51c56adbf}"
    }
  },
  "permissions": [
    "<all_urls>",
    "activeTab"
  ],
  "icons": {
    "48": "icons/opinionated.png",
    "96": "icons/opinionated_2x.png"
  },
  "browser_action": {
    "default_title": "Opinionated"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "match_about_blank": false,
      "js": [
        "content_scripts/opinionated.min.js"
      ]
    }
  ]
}