Examine source code of Tabs Import

{
  "name": "Tabs Import",
  "version": "1.0.5resigned1",
  "description": "Imports URLs from a text file and opens them in the browser",
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "tabs-import@mortalis.org",
      "strict_min_version": "54.0"
    }
  },
  "browser_action": {
    "default_title": "Tabs Import"
  },
  "background": {
    "scripts": [
      "utils.js",
      "main-import.js"
    ]
  },
  "permissions": [
    "tabs",
    "notifications",
    "<all_urls>"
  ]
}