Examine source code of Image Size Filter

{
  "manifest_version": 2,
  "name": "Image Size Filter",
  "version": "1.0",
  "description": "Automatically hides images below a certain size threshold.",
  "permissions": [
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Image Size Filter"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e52e9613-ccb2-49df-b014-0eb01998403d}"
    }
  }
}