Examine source code of FOSS Redirect

{
  "name": "FOSS redirector",
  "description": "Redirects to an open source versions of chosen websites.",
  "version": "1.2",
  "manifest_version": 2,
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "*://reddit.com/*",
    "*://www.reddit.com/*",
    "*://np.reddit.com/*",
    "*://amp.reddit.com/*",
    "*://i.reddit.com/*",
    "*://old.reddit.com/*",
    "*://www.old.reddit.com/*",
    "*://www.youtube.com/*",
    "*://www.twitter.com/*",
    "*://twitter.com/*",
    "*://www.instagram.com/*",
    "*://instagram.com/*",
    "*://youtube.com/*"
  ],
  "icons": {
    "16": "img/icon16.png",
    "24": "img/icon24.png",
    "32": "img/icon32.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_popup": "settings.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cd9380ee-99a4-4d39-8045-825a824db434}"
    }
  }
}