Examine source code of RandomSubreddit

{
  "manifest_version": 2,
  "name": "RandomSubreddit",
  "version": "1.0",
  "description": "Press Alt+F1 to view a random subreddit (Alt+F2 for old reddit)",
  "icons": {
    "16": "icons/randomicon16.png",
    "32": "icons/randomicon32.png",
    "48": "icons/randomicon48.png"
  },
  "browser_action": {
    "default_icon": "icons/randomicon48.png",
    "theme_icons": [
      {
        "light": "icons/randomicon48.png",
        "dark": "icons/randomicon48.png",
        "size": 48
      }
    ],
    "default_title": "Press Alt+F1 or Alt+F2"
  },
  "commands": {
    "randomsub": {
      "suggested_key": {
        "default": "Alt+F1"
      },
      "description": "Opens a random subreddit"
    },
    "oldrandomsub": {
      "suggested_key": {
        "default": "Alt+F2"
      },
      "description": "Opens a random subreddit (old reddit)"
    }
  },
  "background": {
    "scripts": [
      "RandomSubreddit.js"
    ]
  }
}