ajaxXLS Viewer is a web-based spreadsheet viewer that allows you to easily open any .xls file within your Firefox browser. Compatibility with Microsoft Excel and OpenOffice allows ajaxXLS to preserve all your common cell formatting categories such as text styles, decimals, currencies, dates, and times as well as formulas, backgrounds and borders from the original documents. The ajaxXLS web-based editor is still in the early stages of development. With it you can write, edit and save standard spreadsheet files to your local machine. If you would like to try the sneak peak pre-release version of the ajaxXLS editor, please visit the link below.