We don't want to download attachments (e.g. for products) and open them afterwards. Is it possible to open attachments like PDFs directly in the browser? We tried Opera, Chrome and Safari, but all were downloaded instead of opened in the browser.

Which Browser do you recommend or do we need a kind of plugin for it? 

EDIT: Extensions seem to work for inline attachments in messages only. Is it possible to show even the attachments in a browser via the attachments button in OpenERP?