Acrobat Reader FAQ

Installing Acrobat Reader

How do I install Adobe Reader on Windows?

On Windows, simply install Adobe Reader. Mozilla Firefox, SeaMonkey and Opera will detect the browser plugin if Adobe Reader is installed, and the Adobe Reader installer will install the plugin automatically if you install Adobe Reader after your web browser.

How do I install Acrobat Reader on Linux?

To install the Acrobat Reader plugin, copy to your Mozilla plugins directory, and make sure a copy of (or symlink to) the acroread startup script is in your PATH.

Note: Adobe Reader 8.0 includes a script for installing the browser plugin, although it is not run by default when you install it. If you installed Adobe Reader 8.0 to the default location, this script is at the following location:


Important! All users should upgrade to the latest version of Adobe Reader, as earlier versions have known security issues.

How do I install Acrobat Reader on MacOS 9.x?

Simply install Adobe Acrobat Reader. The plugin is automatically installed in the Internet Plug-ins folder in your System Folder.

[Download Acrobat Reader 5.1 (Monolithic)]

What plugin can I use to display PDFs on MacOS X?

On MacOS X, You will need the PDF Browser Plugin, which is available from Schubert it. To install it, do the following:

  1. Download PDF Browser Plugin.
  2. Mount the disk image.
  3. Copy the PDF Browser Plug in to your Internet Plug-ins folder.

Note: This plugin is only free for non-commercial usage. Commercial usage requires purchasing a license. See the product page for more information.

[Download PDF Browser Plugin]

How do I install Acrobat Reader on OS/2 Warp?

To install the Acrobat Plugin on OS/2 Warp, Install Acrobat Reader, then copy nppdfos2.dll to your browser's plugins directory.

[Download Acrobat Reader 3.0]

Information for Solaris users

Note: This information contributed by Clark Frazier Hale

This works with Mozilla 1.4 from SUN, and Acrobat Reader 5.0.9.

Simply creating a link to in the plug-in directory does not allow Acrobat to operate, as it has a dependency in is not linked to (This is a dumb vestige from Netscape 4), so the mozilla startup script does not preload the library. The work-around is something like this:

$ mozilla

However, under Solaris 9 (and perhaps Solaris 8), is not in the default path for trusted libraries, and thus the linker won't load it. The solution for this would be to add /usr/lib to the secure search path, via clre command.

# crle -s /usr/lib/secure:/usr/lib

And if one has a UltraSPARC:

# crle -s /usr/lib/secure/64:/usr/lib/64

Changing the trusted library path could be a potential security risk. I'm not really going to worry about it on a Workstation, though.

Voila, Acrobat now works in Mozilla.

General Questions

What MIME Types can the Acrobat plugin handle?

Adobe Reader 8.x can handle the following MIME Types:

Why does Mozilla save PDFs to disk when I have the plugin installed?

Unfortunately, some web servers send PDF files with an incorrect MIME Type. When this happens, the file is treated as application/octet-stream (generic binary data), and saved to disk by default.

Keyboard shortcuts can not be used when the Acrobat plugin is loaded (full page)

This is a known problem with all plugins, not just the Acrobat plugin. There are several bugs filed on this issue. [Bug List]

Windows Issues

What known issues are there with the Acrobat plugin?

See the dependencies of Bug 336184 for major known issues.

Loading PDF files causes Mozilla to hang or crash. What can I do?

If you are having problems with Adobe Reader, the following troubleshooting steps may help.

How can I remove the Acrobat Plugin?

Delete the file named nppdf32.dll from your Mozilla Firefox plugins folder. You may have to enable showing hidden files to do this.

I didn't install the Acrobat plugin for Mozilla, so why is it using it?

Mozilla's plugin scanning is locating another copy of the Acrobat plugin, using either the Acrobat plugin scan, or the Netscape 4.x plugin scan.

Important! Mozilla configuration files may need to be edited with a text editor that supports Unix line endings, such as Wordpad. Do not use Notepad to edit configuration files.

To disable the Acrobat plugin scan, open \default\pref\winpref.js, and comment the following line by adding // to the start.

pref("plugin.scan.Acrobat", "5.0");

To disable the Netscape 4.x plugin scan, open \default\pref\winpref.js, and uncomment the following line by removing the //.

//pref("plugin.scan.4xPluginFolder", false);

Note that this will prevent any plugins from being detected using the Netscape 4.x plugin scan, not just the Acrobat plugin. More information about plugin scanning.

Note: In recent Mozilla builds, you will need to edit \greprefs\all.js instead of \default\pref\winpref.js.

Linux Issues

Can I use the Adobe Reader plugin on 64bit systems?

Yes, by using nspluginwrapper. Further details are available from the Linux (x86_64) section of PluginDoc.

Support Resources

I have a question that is not answered by this FAQ. Where can I ask it?

If you have a question that is not covered here, please search the MozillaZine forums to see if the problem has been mentioned before. If it hasn't, and the information contained in this FAQ and PluginDoc doesn't help, by all means post to the MozillaZine Forums.

How do I contribute information to this FAQ?

If you wish to contribute information to this FAQ, send an e-mail to Michael Hendy.