.aspx is just a file extension for an ASP.NET web application file.

Can we see the web site you are trying to use? I am assuming you want to open an Adobe PDF from this site. What happens when you try to open it?

It does look like you've got the PDF plug-in.

Attached is a screenshot of what I'm trying to open and the error msg I get. However, in IE it either opens up or I can save it to my desktop. But to open it from the desktop, I need to right-click, open with, Adobe Reader and it opens right up.

http://www.lifeandhealthinsurancenews.com/News/2010/6/Pages/HR-4173-Senate-Conferees-Mull-Fidicuary-Standard-Issue.aspx

You have a typo in Fiduciary in your link:

• http://www.lifeandhealthinsurancenews.com/News/2010/6/Pages/HR-4173-Senate-Conferees-Mull-Fidicuary-Standard-Issue.aspx
• http://www.lifeandhealthinsurancenews.com/News/2010/6/Pages/HR-4173-Senate-Conferees-Mull-Fiduciary-Standard-Issue.aspx

Which add-on/extension do I need to open this site:

http://www.adecco.de/GERMAN/candidates/jobsuche/Pages/DEJobSuche.aspx

The FireFox-version I use is:

Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13

Thanks for help

I'm not having any problems with going to that link and opening that page:

http://www.adecco.de/GERMAN/candidates/jobsuche/Pages/DEJobSuche.aspx

What kind of problems do you have?

• "Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
• "Remove the Cookies" from sites that cause problems: Tools > Options > Privacy > Cookies: "Show Cookies"

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

• Don't make any changes on the Safe mode start window.

See:

• Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems