Viewing PDF files in Firefox

Not sure where to post this, so here goes...
I'm using Firefox 2.0x and Adobe Reader 8.0 on iMac Core2Duo. When I click on a link to a pdf file, the file opens nicely in the browser, but at the same time downloads a copy to my Downloads folder. I don't always want a copy of the pdf. How can I prevent the file from downloading?
In Safari, I do not get the auto download; but can view the file in a browser window.

The Firefox support forums are at http://forums.mozillazine.org/viewforum.php?f=38&sid=ff76c480f43cb2ca0f66992abc0 b96ce
A search on PDF there led to one thread at http://forums.mozillazine.org/viewtopic.php?t=531066&sid=92d8bb8b44de4e8178ce56c 069e63ad9
This would suggest that if you go to Preferences>Content>File Types and open the Manage button, you may be able to alter the action of a PDF file if it is listed there among your download file types.
Mac Mini G4 1.25 Mac OS X (10.4.9)

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If possible I would prefer to use Adobe's solution if there is one.

See --> http://kb2.adobe.com/cps/888/cpsid_88813.html#main_Mac_OS__Firefox_ 
See --> https://support.mozilla.org/en-US/kb/Opening%20PDF%20files%20within%20Firefox 
See --> https://support.mozilla.org/en-US/kb/Managing%20file%20types#os=mac&browser=fx9
'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''
Not related to your question, but...
You may need to update some plug-ins. Check your plug-ins and update as necessary:
*Plug-in check --> http://www.mozilla.org/en-US/plugincheck/
*Adobe Shockwave for Director Netscape plug-in: [https://support.mozilla.org/en-US/kb/Using%20the%20Shockwave%20plugin%20with%20Firefox#w_installing-shockwave Installing ('''''or Updating''''') the Shockwave plugin with Firefox]
*Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.org/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox]
*'''''Shockwave Flash''''' (Adobe Flash or Flash): [https://support.mozilla.org/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox]
*Next Generation Java Plug-in for Mozilla browsers: [https://support.mozilla.org/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

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== This happened ==
Every time Firefox opened
== after updating firefox

See:
http://support.mozilla.com/en-US/kb/Opening+PDF+files+within+Firefox
http://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox
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'''Update Java''': your ver. 1.6.0; current ver. 1.6.0.20 (important security update 04-15-2010)
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'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''

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