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Pace

Pace is an automatic page load progress bar. Pace will automatically monitor your ajax requests, event loop lag, document ready state, and elements on your page to decide the progress. Pace includes 14  animated themes to choose from!

This extension uses pace.js created by by Zack Bloom (JavaScript) and by Adam Schwartz (CSS).
See the website for more details: http://github.hubspot.com/pace/
Download (Last update: May 5, 2016)
Pace Extension