The bill history (seems to only look back as far as the prev 12 months, so with us on per quarter only see three there at any one time) appears to work most times now. We are all on Firefox, even the Galaxy S3's, for our browser! The bill history can be expanded to a summary screen.
With the beauty of VOIP there are always the same entries on each bill and they vary by cents!
Work has steered us to Chrome, which I also like. Firefox all the way at home though!
Going through my office recently - found a really old Telstra bill which was just south of $400.00
Gone are the BIG Telstra Taxes, courtesy of VOIP and in not too distant future I am hoping to never ever sight another Telstra BILL in our mail box - EVER