Can't Find Page Navigation Icons in Acrobat Extension for Chrome

Hi

I have the Acrobat Reader extension for Chrome. When I read a document, I'd like to be able to go back to a page that I had recently seen. Uusally this is done under page navigation icons, but I can't find any in the Acrobat extension, and there are none in Google Chrome itself.

All help would greatly be appreciated.

Thanks a lot in advance 🙂