Examine source code of Simple Image Filters

{
  "manifest_version": 2,
  "name": "Simple Image Filters",
  "version": "1.0",
  "description": "Apply visual filters to all images on the page.",
  "icons": {
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_title": "Simple Image Filters",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a3a6a13e-d075-453b-bdb4-611f4e40877f}",
      "strict_min_version": "117.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}