Examine source code of Rewritify

{
  "manifest_version": 2,
  "name": "Rewritify",
  "version": "1.1resigned1",
  "description": "Replace text across all websites using regular expressions. It's like find and replace for the entire internet!",
  "icons": {
    "48": "icons/ic_find_replace_black_48dp_1x.png",
    "96": "icons/ic_find_replace_black_48dp_2x.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "rewrite.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{20ab8402-8ffc-497c-859b-81900038e79a}"
    }
  }
}