Examine source code of Reading Ruler with Notes

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    "storage",
    "activeTab",
    "scripting"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
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  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e5d0b2a0-c3e9-3f2c-a9d2-b2e1f0b3c1a2}",
      "data_collection_permissions": {
        "required": [
          "none"
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