Examine source code of SimpleBlockPages

{
  "manifest_version": 2,
  "name": "SimpleBlockPages",
  "version": "0.0.6resigned1",
  "description": "A simple extension to help you block a list of sites (using regex).",
  "icons": {
    "48": "icons/border-48.png"
  },
  "permissions": [
    "storage",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "me@pablorosales.xyz",
      "strict_min_version": "57.0a1"
    }
  },
  "options_ui": {
    "page": "src/options.html",
    "browser_style": true
  }
}