Examine source code of Filters

{
  "manifest_version": 2,
  "name": "Filters",
  "version": "0.0.1",
  "description": "Adjust brightness and colors of web pages",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "storage",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "16.png",
    "32": "32.png",
    "64": "64.png",
    "128": "128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7906e43c-1732-49c5-91dc-9598e541326e}"
    }
  }
}