Examine source code of Trendless FB

{
  "manifest_version": 2,
  "name": "Trendless FB",
  "version": "2.0.1resigned1",
  "description": "Removes the Trending sidebar on Facebook.",
  "content_scripts": [
    {
      "matches": [
        "*://*.facebook.com/*"
      ],
      "js": [
        "trendless-fb.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@trendless_fb"
    }
  }
}