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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "background": {
    "service_worker": "lasttabback-service-worker.js"
  },
  "content_scripts": [
    {
      "js": [
        "lasttabback-default.js",
        "lasttabback-content-script.js"
      ],
      "run_at": "document_end",
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "css": [
        "lasttabback-alert.css"
      ]
    }
  ],
  "options_page": "options.html",
  "name": "Last Tab Back",
  "description": "Use the back key to close the tab if there are no pages to go back to. When it closes, go to the tab that created it.",
  "version": "0.8.0.4",
  "minimum_chrome_version": "88",
  "action": {
    "default_icon": "icons/back.png",
    "default_title": "Last Tab Back - Click to go back, or close and go to the last tab if there are no more pages (Backspace works too)"
  },
  "icons": {
    "16": "icons/16x16.png",
    "32": "icons/32x32.png",
    "48": "icons/48x48.png",
    "128": "icons/128x128.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "webNavigation",
    "scripting",
    "storage",
    "alarms"
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*"
  ]
}