Description from extension meta
Extension allows user to see loading time based on performance api's getEntries() method
Image from store
Description from store
It is based on message passing in chrome. Apis are based on performance.getEntries() & are linked below. You can also obtain more information by using performance.getEntries() or performance.timing.
Note: Extension does not require any permissions from the users.
-http://blog.trasatti.it/2012/12/measuring-the-speed-of-resource-loading-with-javascript-and-html5.html
-https://developer.mozilla.org/en-US/Add-ons/WebExtensions/API/browserAction/setBadgeText