The need for multiple browsers on your computer

When repairing computers, many of my customers ask why I install Firefox and Chrome when they already have Internet Explorer.  I typically explain that it never hurts to have an alternative browser on your computer.  Often you will load a web page or website that doesnt seem to load correctly or not at all.  In many instances, this is a result of the web browser.  Considering how often web browsers are being updated these days (my personal shot at Firefox and this silly 6 week update schedule), often these updates can cause problems with websites and particular pages.  Today, I had a case of a relative who needed to access Sallie Mae to complete a online registration.  Upon completion of the process, she had to identify a captcha to verify her actions.  For some reason, Firefox (version 6) would not show the captcha.  After determining that nothing in the settings would prevent the image from appearing, I gave up and just told her to use Google Chrome to complete the sign-up.  2 minutes later, we were done.  She was wondering what I did to fix the problem, I simply told her if a certain webpage or site has problems rendering in a particular browser, simply open it in another browser, most times, that solves the problem.  No point in finding out what in Firefox was the issue, they'll just be updating it in the next month again.