Examine source code of Redlib Redirect

{
  "manifest_version": 2,
  "version": "3.0.1",
  "name": "Redlib Redirect",
  "description": "Redirect from Reddit to a privacy respecting alternative automatically",
  "homepage_url": "https://github.com/simon1573/redlib-redirect",
  "icons": {
    "240": "icons/redirect-240.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{70021972-3f2e-4738-90f9-29341711ead2}"
    }
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "*://reddit.com/*",
    "*://www.reddit.com/*",
    "*://old.reddit.com/*"
  ],
  "background": {
    "scripts": [
      "redirect.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  }
}