Examine source code of BlaseballHelper

{
  "manifest_version": 2,
  "name": "BlaseballHelper",
  "version": "1.0",
  "description": "Fucks with blaseball team order",
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.blaseball.com/*"
      ],
      "js": [
        "blaseballer.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_icon": "icons/icon-32.png",
    "default_title": "BlaseballHelper",
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "storage",
    "tabs"
  ]
}