How do I continue to be able to download Adobe pdf files with FF4.0 as I was able to with all previous version?

Question

With FF 4.0 I can no longer download Adobe pdf files. At any website when I click the pdf icon something is displayed about a plugin-handler and nothing further happens - there is either no download or the download stops. Sometimes a partial frame of the pdf frame displays but nothing further happens. I never had this problem with previous versions of FF.

Answer 1

You must be doing something wrong, or perhaps Windows 7 is interfering. Here's the step-by-step process:
Launch LabVIEW 2009.
Open an 8.6 VI. It should show up with an asterisk in the title bar.
Make some changes.
Select File -> Save for Previous Version.
Verify that "8.6" is selected in the dropdown.
Click "Save...".
In the dialog click the "Save" button to accept the default of saving the VI into a new folder called "<VI Name> Folder".
Close the VI. When asked if you want to save changes click "Don't Save".
Check the timestamp on the newly created file in that folder.
Open the same 8.6 VI again.
Make some changes. 
Select File -> Save for Previous Version.
Verify that "8.6" is selected in the dropdown.
Click "Save...".
The "File name" textbox should have the same default name as previously. If you click "Save" Windows should move you into that folder, and the save dialog should remain open. The file listing should contain the VI.
Click on the "Current Folder" button. You should get a dialog warning you that the operation will save over existing files. Click "OK" to continue. The VI will be saved as the previous version over the previous save that was done. To verify this, check the timestamp on the file.
I just did the above on LV2009 running under XP just so I could get the button names correct.
You can repeat steps 10-16 as many times as you want without needing to create a new folder.