SSRS - Browser doesn't go wide enough to show report

I have a report with a given number of columns, but when viewed in the browser it cuts off at about the 5th column from the right. Granted, the report is really wide (25 columns or so), but isn't the whole point of a browser-based rendering system that the browser should automatically and fluently handle things like scrolling and showing wide things without the need to custom code?
How do I force the browser display to show everything in the report?

I should clarify. IE is the one with the problem, Firefox displays it fine.

This is especially frustrating, since I have to use IE with our SSRS for most other things to work - like the drop-downs next to folders or reports.