Examine source code of Newsbleed

{
  "manifest_version": 2,
  "name": "Newsbleed",
  "description": "Leave the filter bubble behind",
  "version": "1.0.4resigned1",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.facebook.com/*"
      ],
      "css": [
        "newsbleed.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{105c3ca7-07fe-4e47-8d8d-555eeb012ce9}"
    }
  }
}