Detects public Now sites and offers a handy way to view the site's source code on Zeit.
Zeit offer a solution called Now - https://zeit.co/now
The source code for certain deployed sites are available at a special URL: https://[site-name-dot-com]/_src
This extension will send a quick request to every site you visit and check if the "/_src" page exists; if it does, it adds a "View Now Source" button to the webpage, so you can easily browse the source code of the site.
Demo: https://static-kbt3a2601.now.sh/