Examine source code of Interface enhancer for BGG

{
  "name": "__MSG_name__",
  "short_name": "BGG interface enhancer",
  "description": "__MSG_description__",
  "default_locale": "en",
  "icons": {
    "16": "images/bgg_16.png",
    "48": "images/bgg_48.png",
    "128": "images/bgg_128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "js/content.js"
      ],
      "matches": [
        "*://boardgamegeek.com/*",
        "*://*.boardgamegeek.com/*"
      ]
    }
  ],
  "action": {
    "default_icon": {
      "16": "images/bgg_16.png",
      "48": "images/bgg_48.png",
      "128": "images/bgg_128.png"
    },
    "default_popup": "popup.html",
    "default_title": "__MSG_popup_title__"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "manifest_version": 3,
  "permissions": [
    "declarativeNetRequest",
    "declarativeNetRequestFeedback",
    "scripting",
    "storage",
    "contextMenus",
    "tabs"
  ],
  "host_permissions": [
    "*://boardgamegeek.com/*",
    "*://*.boardgamegeek.com/*"
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset_1",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "popup.css",
        "images/*.png"
      ],
      "matches": [
        "https://*/*"
      ]
    }
  ],
  "version": "0.1.3",
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@bgg.lnkr.info"
    }
  }
}