Examine source code of Old Reddit For Firefox

{
  "name": "Old Reddit For Firefox",
  "description": "For those who prefer the old reddit interface.",
  "version": "1.7.8",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "*://*.reddit.com/*"
  ],
  "icons": {
    "16": "./images/old_reddit_16.png",
    "32": "./images/old_reddit_32.png",
    "48": "./images/old_reddit_48.png",
    "128": "./images/old_reddit_128.png"
  },
  "options_ui": {
    "page": "options/index.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://reddit.com/*",
        "*://www.reddit.com/*"
      ],
      "run_at": "document_start",
      "js": [
        "content.js"
      ]
    },
    {
      "matches": [
        "*://old.reddit.com/*"
      ],
      "run_at": "document_start",
      "js": [
        "content_old_reddit.js"
      ]
    },
    {
      "matches": [
        "*://old.reddit.com/*"
      ],
      "run_at": "document_end",
      "js": [
        "content_sub_styles.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ebaae99b-7e09-4cd7-9744-17a98f211632}"
    }
  }
}