Examine source code of Page action button for Freedium

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manifest.json
{
  "manifest_version": 2,
  "name": "Page action button for Freedium",
  "description": "Adds a URL bar button to open Medium.com page in Freedium",
  "version": "0.1",
  "applications": {
    "gecko": {
      "id": "open_in_freedium_page_action@emvaized.dev"
    }
  },
  "developer": {
    "name": "Max Tsyba",
    "url": "https://github.com/emvaized/"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "64": "icon.svg"
  },
  "permissions": [
    "*://medium.com/*"
  ],
  "page_action": {
    "default_icon": "icon.svg",
    "default_title": "Open in Freedium",
    "show_matches": [
      "*://medium.com/*"
    ],
    "hide_matches": [
      "*://medium.com/m/*"
    ]
  }
}