Compare the same page accross multiple sites.
This chrome extension can be used to compare the same page across multiple sites. For example, it could be configured to open the production, staging, and development version of a site.
For more details on how to use and configure the extension, see:
This extension is open source. Visit the website link on the chrome store or go to https://github.com/ConorSheehan1/chrome-compare to check out the source code. Pull requests welcome :)