Examine source code of UrlToJD2

{
  "manifest_version": 2,
  "name": "UrlToJD2",
  "version": "2.1",
  "description": "Push an url to JDownloader 2 GrabberLink or Download",
  "developer": {
    "name": "GTeam",
    "url": "https://framagit.org/GTeam/UrlToJD2"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "urltojd2@gteam.fr",
      "strict_min_version": "60.0"
    }
  },
  "icons": {
    "16": "icons/urltojd2-16.png",
    "32": "icons/urltojd2-32.png",
    "48": "icons/urltojd2-48.png",
    "96": "icons/urltojd2-96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "page_action": {
    "default_icon": {
      "19": "icons/urltojd2-19.png",
      "38": "icons/urltojd2-38.png"
    },
    "show_matches": [
      "<all_urls>"
    ],
    "default_title": "Send current url to JD2",
    "browser_style": true,
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "activeTab",
    "*://*/flashgot?*",
    "webRequest",
    "webRequestBlocking",
    "menus"
  ]
}