Add Last Active Class To Tab

Add a last-active class to last accessed Tree Style Tab

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manifest.json

{
  "manifest_version": 2,
  "name": "Add Last Active Class To Tab",
  "version": "1.2resigned1",
  "description": "Add a last-active class to a TST tab",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "[email protected]",
      "strict_min_version": "60.0"
    }
  }
}