Examine source code of Unpopularize

{
  "manifest_version": 2,
  "name": "Unpopularize",
  "version": "2.1resigned1",
  "description": "Removes popular tweets from your timeline.",
  "icons": {
    "32": "icons/unpopularize-32.png",
    "48": "icons/unpopularize-48.png",
    "128": "icons/unpopularize-128.png"
  },
  "browser_action": {
    "default_icon": "icons/unpopularize-32.png",
    "default_title": "Unpopularize"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.twitter.com/*"
      ],
      "js": [
        "unpopularize.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{34b0f337-a695-4689-89b6-d898f08d2bd3}"
    }
  }
}