Examine source code of LightGrab

{
  "manifest_version": 2,
  "name": "LightGrab",
  "version": "0.4",
  "author": "Adam Ahern",
  "homepage_url": "https://gitlab.com/adamahern/lightgrab",
  "description": "GS Lightning link grabber. Opens cases in an existing tab instead of a new one.",
  "applications": {
    "gecko": {
      "id": "{c294b90a-8dfe-4bd9-83be-0b0dfa7a4390}"
    }
  },
  "permissions": [
    "activeTab",
    "tabs",
    "tabHide",
    "*://vmware-gs.lightning.force.com/*"
  ],
  "icons": {
    "48": "icons/grab48.jpg",
    "96": "icons/grab96.jpg"
  },
  "background": {
    "scripts": [
      "load.js"
    ]
  }
}