Examine source code of Reddit Enhancer

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "version": "3.1.2",
  "description": "__MSG_extensionDescription__",
  "author": "github.com/joelacus",
  "default_locale": "en",
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png",
    "256": "icons/icon-256.png"
  },
  "permissions": [
    "storage",
    "tabs",
    "declarativeNetRequest",
    "contextMenus"
  ],
  "optional_permissions": [
    "downloads",
    "history"
  ],
  "host_permissions": [
    "*://*.reddit.com/*",
    "*://*.redd.it/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "content_first.js"
      ],
      "css": [
        "RE_styles.css"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "content.js"
      ]
    },
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "system_theme_detector.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "_locales/**/*",
        "changelog.txt",
        "RE_styles.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "64": "icons/icon-64.png",
      "128": "icons/icon-128.png"
    }
  },
  "options_page": "options.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{46abbc04-ce38-475f-9ef8-e0a4a59d0c9f}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "image_ruleset",
        "enabled": false,
        "path": "rules/image_ruleset.json"
      },
      {
        "id": "rv1_ruleset",
        "enabled": false,
        "path": "rules/rv1_ruleset.json"
      },
      {
        "id": "rv3_ruleset",
        "enabled": false,
        "path": "rules/rv3_ruleset.json"
      }
    ]
  }
}