Examine source code of Tab Extract

{
  "manifest_version": 2,
  "name": "Tab Extract",
  "version": "1.0.5resigned1",
  "description": "A simple & lightweight tool to reduce tab clutter, using just the address bar.",
  "icons": {
    "48": "icons/icon_048.png"
  },
  "omnibox": {
    "keyword": "ex"
  },
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "tabExtract.js"
    ]
  },
  "applications": {
    "gecko": {
      "strict_min_version": "52.0a1",
      "id": "{5f19c5b2-8ef9-4f63-9d0b-d13bc476972a}"
    }
  }
}