Examine source code of Reddit Comment Replacer

{
  "description": "Replace historical reddit content",
  "manifest_version": 2,
  "name": "Replace Reddit Comments",
  "version": "1.1",
  "content_scripts": [
    {
      "matches": [
        "*://reddit.com/*",
        "*://old.reddit.com/*",
        "*://mobile.reddit.com/*",
        "*://*.reddit.com/*"
      ],
      "js": [
        "main.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_title": "Reddit Content Replacer",
    "default_icon": {
      "48": "logo48.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{07b2eeb0-c434-4985-864d-b542b9aa45b6}"
    }
  }
}