Examine source code of New tab button for toolbar

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manifest.json

{
  "description": "Toolbar button to open new tab with user's newtab content",
  "manifest_version": 2,
  "name": "New tab toolbar button",
  "version": "1.1resigned1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "newtab-plus-16.png",
      "32": "newtab-plus-32.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{36ddc666-962f-4f57-a882-f65c2e2b3a56}"
    }
  }
}