Examine source code of htm-del

{
  "author": "Jamie Nolan",
  "background": {
    "page": "page.html"
  },
  "description": "An extension to statically remove elements from HTML pages",
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "manifest_version": 2,
  "name": "htm-del",
  "options_ui": {
    "page": "options.html"
  },
  "browser_action": {
    "default_icon": "icon.svg",
    "default_title": "htm-del",
    "default_popup": "action.html"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "http://*/*",
    "https://*/*",
    "storage"
  ],
  "version": "1.1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{51578cd4-0c6e-4ec8-a0aa-8a91953f465d}"
    }
  }
}