Examine source code of Content Filter

{
  "name": "Content Filter",
  "description": "Remove content from the DOM based on regex",
  "version": "1.2resigned1",
  "icons": {
    "128": "black.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "all_frames": true,
      "js": [
        "content-filter.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Remove content from the DOM based on regex"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{d12d63d9-5379-4522-ae03-ce4829043e22}"
    }
  }
}