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How do I get Firefox to open .aspx files in Adobe? When will this extension be added to Mozilla Firefox?


.aspx files will open in IE but not Mozilla Firefox. Why?

This happened

A few times a week

== when trying to open .aspx files

Additional System Details

Installed Plug-ins

  • -NPCpnMgr
  • IE Tab 2 Plug-in for Mozilla/Firefox
  • Office Plugin for Netscape Navigator
  • Ask Toolbar Plugin Stub for 32-bit Windows
  • Coupons, Inc. Coupon Printer DLL
  • Coupons, Inc. Coupon Printer Plugin
  • RealPlayer(tm) LiveConnect-Enabled Plug-In
  • RealJukebox Netscape Plugin
  • Adobe PDF Plug-In For Firefox and Netscape "9.3.2"
  • Default Plug-in
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • ActiveTouch General Plugin Container Version 105
  • Shockwave Flash 10.1 r53
  • Adobe Shockwave for Director Netscape plug-in, version 11.0
  • iTunes Detector Plug-in
  • GEPlugin
  • 3.0.50106.0
  • Virtual Earth 3D 4.00090316005 plugin for Mozilla
  • Google Updater pluginhttp://pack.google.com/
  • Rhapsody Player Engine Plugin
  • Google Update
  • Java(TM) Platform SE binary
  • Next Generation Java Plug-in 1.6.0_20 for Mozilla browsers
  • Npdsplay dll
  • DRM Store Netscape Plugin
  • DRM Netscape Network Object


  • User Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20100401 AskTbMP3R7/ Firefox/3.6.3 GTB7.0 ( .NET CLR 3.5.30729)

More Information

rjohnson19 39 solutions 240 answers

.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.

Helpful Reply

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.

FirefoxKasi 0 solutions 1 answers

Helpful Reply

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


The FireFox-version I use is:

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

Thanks for help

  • Top 10 Contributor
  • Moderator
10777 solutions 97001 answers

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


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 Troubleshoot Firefox issues using Safe 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.