Examine source code of NJS

{
  "manifest_version": 2,
  "name": "NJS",
  "version": "0.9.6resigned1",
  "default_locale": "en",
  "description": "__MSG_extensionDescription__",
  "developer": {
    "name": "__MSG_devName__",
    "url": "https://www.facebook.com/paradoxfm"
  },
  "homepage_url": "https://github.com/paradoxfm/firefox_njs",
  "icons": {
    "48": "js_on.svg",
    "96": "js_on.svg"
  },
  "page_action": {
    "browser_style": true,
    "default_icon": "js_on.svg",
    "default_title": "Javascript Enabled"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "tabs"
  ],
  "applications": {
    "gecko": {
      "strict_min_version": "54.0",
      "id": "{3a1422fb-6d3a-491a-a3b8-5bc7508cdc29}"
    }
  }
}