Thanks for the correction. The only analysis I have found is this blog post from someone at Opera (Published: 2014-04-07, Updated: 2015-08-26). Do you know when the &quot;Default Browser Helper&quot; plug-in is instantiated? It was shipped in OS X 10.9, so it may no longer be relevant.<p><a href="https:&#x2F;&#x2F;www.aeyoun.com&#x2F;technote&#x2F;default-browser-plugin.html" rel="nofollow">https:&#x2F;&#x2F;www.aeyoun.com&#x2F;technote&#x2F;default-browser-plugin.html</a>