Examine source code of rmElem

{
  "manifest_version": 2,
  "name": "rmElem",
  "version": "0.1",
  "description": "Annoyed by a sticky header or intrusive pop-up? Remove any element on the page in one click! Simple and doesn't need any permission.",
  "icons": {
    "48": "icons/icon-48.svg",
    "96": "icons/icon-48.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "page_action": {
    "browser_style": false,
    "default_icon": {
      "19": "icons/icon-48.svg",
      "38": "icons/icon-48.svg"
    },
    "default_title": "Remove elements",
    "show_matches": [
      "*://*/*"
    ]
  },
  "permissions": []
}