Examine source code of SilverBullet Clipper

{
  "name": "SilverBullet Clipper",
  "version": "1.3.5",
  "manifest_version": 2,
  "description": "SilverBullet Clipper captures a web page URL or selected content, converts it to markdown and saves it in the SilverBullet Inbox",
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "browser_action": {
    "default_popup": "html/popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "32": "images/icon32.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "js/service-worker.js"
    ]
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "storage",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "silverbullet-clipper@burke.ext",
      "strict_min_version": "100.0"
    }
  }
}