RePlurk for Google Chrome...
Enhances Google pages by adding ajax loader (Animated GIF and Animated PNG - APNG). Ajax Loader for Google™ is an extension that adds an ajax loader to the Google™ pages (Gmail, Google Calendar, Google Docs, Google Maps, Google Reader, Google Sites and Google Analytics). If you want to change the loader, please follow these steps: Go to the [MENU] -> Tools -> Extensions -> And click on this extension options. (see the last screenshot) You can choose between GIFs and APNG images. APNG (animated PNG) images works in version 60.0.3076.0 Google Chrome Canary. Thanks for loaders from: http://loadingapng.com/