TypeError: securityInfo.certs[0] is undefined

[MaffooClock]

When using with a site having a security exception (e.g. allowing a self-signed certificate), the page is blank. Inspecting the addon's console reveals:

TypeError: e.certs[0] is undefined

...where e would be the minified alias to securityInfo in the render() function. The offending line is:

certainly-something/src/viewer/js/render.js

Line 92 in 511f5a5

document.title = `${securityInfo.certs[0].subject.cn} (Certainly Something)`;

This behavior probably explains the problem in Issue #72.