Examine source code of New tab button (dark mode)

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manifest.json

{
  "description": "Toolbar button to open new tab with user's newtab content (dark mode)",
  "manifest_version": 2,
  "name": "New tab toolbar button (dark mode)",
  "version": "1.0",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "newtab-plus-16.png",
      "32": "newtab-plus-32.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0788a2f6-42a3-49bf-9512-65ba9ae6b09c}"
    }
  }
}