Examine source code of Browser to Steam

{
  "manifest_version": 2,
  "name": "Browser-Steam",
  "version": "1.2resigned1",
  "description": "Open steamcommunity.com in Steam client",
  "homepage_url": "https://github.com/demol0cv/browsertosteamclient-webext",
  "icons": {
    "48": "icons/steam-48.png"
  },
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "default_icon": "icons/steam-32.png",
    "default_title": "Browser to Steam"
  },
  "background": {
    "scripts": [
      "borderify.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.steamcommunity.com/*",
        "*://store.steampowered.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{122b6f8f-f2f5-4826-bc2a-bd4912441e86}"
    }
  }
}