Examine source code of format-copy

{
  "manifest_version": 2,
  "name": "format-copy",
  "version": "1.0",
  "description": "Specify a format to copy links",
  "homepage_url": "https://github.com/yi-fan-song/format-copy-for-firefox",
  "icons": {
    "48": "icons/content_copy_white_48dp.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "clipboardWrite"
  ],
  "browser_action": {
    "default_icon": "icons/content_copy_white_48dp.png",
    "default_title": "Copy and format"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}