Examine source code of Blacklist AutoClose

{
  "manifest_version": 2,
  "name": "Blacklist Autoclose",
  "version": "2.2.0",
  "description": "Automatically close all blacklisted webpages specified by the user. Useful for dealing with popups that redirects you to another page.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{74108f18-bfa1-4cd3-a0b1-6c575ee3dce0}",
      "strict_min_version": "92.0"
    }
  },
  "browser_action": {
    "default_icon": "./assets/icon/cross128.png",
    "default_popup": "./popup/index.html"
  },
  "options_ui": {
    "page": "./options/index.html",
    "open_in_tab": true,
    "browser_style": true,
    "chrome_style": true
  },
  "background": {
    "page": "./background/index.html"
  },
  "icons": {
    "48": "./assets/icon/cross48.png",
    "128": "./assets/icon/cross128.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "webNavigation",
    "downloads"
  ]
}