Examine source code of Broom

{
  "manifest_version": 2,
  "name": "Broom",
  "version": "1.0.6",
  "description": "Sweep your data up!",
  "homepage_url": "https://store.slothby.club/l/broom",
  "icons": {
    "24": "icons/logo/24px.png",
    "48": "icons/logo/48px.png",
    "96": "icons/logo/96px.png",
    "128": "icons/logo/128px.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "downloads"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "mac": "Command+Shift+E",
        "default": "Ctrl+Shift+E"
      },
      "description": "Toggle the UI"
    }
  },
  "browser_action": {
    "default_icon": "icons/logo/96px.png",
    "default_title": "Broom"
  },
  "background": {
    "scripts": [
      "background/index.js"
    ],
    "persistent": false
  },
  "options_ui": {
    "page": "webAccessible/index.html",
    "open_in_tab": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "contentScripts/index.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "webAccessible/*",
    "help/*",
    "icons/*",
    "style.css"
  ],
  "applications": {
    "gecko": {
      "id": "broom@slothby.club",
      "strict_min_version": "90.0"
    }
  }
}