Examine source code of NoHTTP

{
  "manifest_version": 2,
  "name": "NoHTTP",
  "version": "1.2resigned1",
  "description": "Prevents insecure HTTP requests from being made.",
  "homepage_url": "https://gitlab.com/chrismoore/nohttp",
  "icons": {
    "24": "icons/shield-on.svg",
    "48": "icons/shield-on.svg",
    "96": "icons/shield-on.svg"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/shield-on.svg",
      "32": "icons/shield-on.svg",
      "64": "icons/shield-on.svg"
    },
    "default_title": "NoHTTP"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{90e644f1-3a32-4bf6-be8f-8ed571c0287b}"
    }
  }
}