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Well somehow Adobe got loaded it seems.<br />
<br />
This error occurs sometimes with Adobe Reader X on Windows 7, Vista, or sometimes XP. <br />
So check your Installed Applications through Control Panel and remove Adobe if it's there.
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small underline comment here, in Mozilla´s last build (19) there is their own PDF viewer built-in<br />
<a href="http://www.mozilla.org/en-US/firefox/19.0beta/releasenotes/" rel="ugc nofollow">http://www.mozilla.org/en-US/firefox/19.0beta/releasenotes/</a>
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<div class="content wysiwyg-content">
When opening a .pdf file in Firefox with FoxIt Phantom PDF set as my default program I get the follow error:<br />
<br />
There is a problem with Adobe Acrobat/Reader.<br />
If it is running, please exit and try again (1).<br />
<br />
I don't even have Adobe Reader loaded.<br />
<br />
Why does this happen, and how do I correct it?
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When opening a .pdf file in Firefox with FoxIt Phantom PDF set as my default program I get the follow error:

There is a problem with Adobe Acrobat/Reader.
If it is running, please exit and try again (1).

I don't even have Adobe Reader loaded.

Why does this happen, and how do I correct it?

Well somehow Adobe got loaded it seems.

This error occurs sometimes with Adobe Reader X on Windows 7, Vista, or sometimes XP. 
So check your Installed Applications through Control Panel and remove Adobe if it&amp;#39;s there.

small underline comment here, in Mozilla´s last build (19) there is their own PDF viewer built-in
http://www.mozilla.org/en-US/firefox/19.0beta/releasenotes/

Firefox won&amp;#39;t use default .pdf viewer

When opening a .pdf file in Firefox with FoxIt Phantom PDF set as my default program I get the follow error:

There is a problem with Adobe Acrobat/Reader.
If it is running, please exit and try again (1).

I don&amp;#39;t even have Adobe Reader loaded.

Why does this happen, and how do I correct it?

Firefox won't use default .pdf viewer

Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.