I can no longer open .pdf files in Firefox 4

Ever since I moved to the beta version of Firefox 4, I have lost the ability to view .pdf files in Firefox. I was convinced this was a problem totally with Firefox, but at around the same time I upgraded from an old G4 PPC laptop to a new Macbook Pro. Now I find I can't view .pdf files in Safari either. Is this a problem with Firefox, or a problem with the way I have configured my new computer?

I have the same problem and I agree with firebunny. This is really bad style from Mozilla. You should have thought about a problem such as viewing pdf's in the browser and compatible pdf-reader plug-ins.
My Adobe Acrobat plug-in was disabled by default when I installed FF 4 rendering viewing and downloading pdf's impossible. Now I am stuck with this browser and am considering going back to the last 3.6.16 version that I still use at my workplace without any problem.
Also I agree that this has nothing to do with the pdf readers that should be installed on the PC but with FF 4. I can prove this since I installed foxit-reader which also comes with a FF compatible plug-in. Neither here did selecting this as the default pdf application help nor does it enable downloads.

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1. Quit Internet Explorer(any other browser)
2. Start Acrobat or Adobe Reader.
3. Choose Edit > Preferences.
4. Select Internet in the list on the left.
5. Deselect(Uncheck) Display PDF in Browser, and click OK.
6. Restart Internet Explorer

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SAFARI CAN'T OPEN PDF'S ?
I can no longer open pdf files in safari 6.02. It worked fine up until 2 weeks ago. The pdf's open in Foxfire and Chrome browsers.
I can also download the pdf and open in acrobat directly. Safari only shows the file as ASCII characters.
Any suggestions?
Thanks,
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Back up all data.
Triple-click the line of text below to select it, the copy the selected text to the Clipboard (command-C):
/Library/Internet Plug-ins
In the Finder, select
Go ▹ Go to Folder
from the menu bar, or press the key combination shift-command-G. Paste (command-V) into the text box that opens, then press return.
From the folder that opens, remove any items that have the letters “PDF” in the name. You may be prompted for your login password. Then quit and relaunch Safari, and test.
I've seen an unconfirmed report that the "Silverlight" web plugin distributed by Microsoft can also interfere with PDF display in Safari, so you might need to remove it as well, if applicable.
If you still have the issue, repeat with this line:
~/Library/Internet Plug-ins
If you don’t like the results of this procedure, restore the items from the backup you made before you started. Relaunch Safari again.

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Back up all data.
Triple-click the line of text below to select it, the copy the selected text to the Clipboard (command-C):
/Library/Internet Plug-ins
In the Finder, select
Go ▹ Go to Folder
from the menu bar, or press the key combination shift-command-G. Paste (command-V) into the text box that opens, then press return.
From the folder that opens, remove any items that have the letters “PDF” in the name. You may be prompted for your login password. Then quit and relaunch Safari, and test.
I've seen an unconfirmed report that the "Silverlight" web plugin distributed by Microsoft can also interfere with PDF display in Safari, so you might need to remove it as well, if applicable.
If you still have the issue, repeat with this line:
~/Library/Internet Plug-ins
If you don’t like the results of this procedure, restore the items from the backup you made before you started. Relaunch Safari again.

Why can't I open PDF files in Firefox?

I cannot get PDF files to open for viewing in Firefox. I am on Mac OS platform. This seems to be such an ongoing issue. I have followed the troubleshooting procedures to no avail. I like the look of Firefox better than Chrome, but I am switching over to Chrome because PDF's are so much easier to handle on Chrome, and I am sick of wasting time with this. Any last minute tips or advice?

The Adobe Reader plugin may not be working properly on Mac.
* https://support.mozilla.org/kb/pdf-files-are-blank-and-cant-be-downloaded-mac
* https://support.mozilla.org/kb/Opening+PDF+files+within+Firefox
Disable the Adobe Reader plugin in Firefox (Tools > Add-ons > Plugins) and use the external Adobe Reader application or Preview application instead.
PDF files may be found under entries like Portable document or Adobe PDF document or Adobe Acrobat Document.
*Firefox > Preferences > Applications > Adobe PDF document : Use Adobe Reader

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Back up all data before making any changes. Please take each of the following steps until the problem is resolved.
Step 1
If Adobe Reader or Acrobat is installed, and the problem is just that you can't print or save PDF's displayed in Safari, you may be able to do so by moving the cursor to the the bottom edge of the page, somewhere near the middle. A black toolbar should appear under the cursor. Click the printer or disk icon.
Step 2
There should be a setting in its preferences of the Adobe application such as Display PDF in Browser. I don't use those applications myself, so I can't be more precise. Deselect that setting, if it's selected.
Step 3
If you get a message such as ""Adobe Reader blocked for this website," then from the Safari menu bar, select
Safari ▹ Preferences... ▹ Security
and check the box marked
Allow Plug-ins
Then click
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Step 4
Triple-click anywhere in the line of text below on this page to select it, the copy the selected text to the Clipboard by pressing the key combination command-C:
/Library/Internet Plug-ins
In the Finder, select
Go ▹ Go to Folder
from the menu bar, or press the key combination shift-command-G. Paste into the text box that opens by pressing command-V, then press return.
From the folder that opens, move to the Trash any items that have "Adobe" or “PDF” in the name. You may be prompted for your login password. Then quit and relaunch Safari.
Step 5
The "Silverlight" web plugin distributed by Microsoft can interfere with PDF display in Safari, so you may need to remove it, if it's present. The same goes for a plugin called "iGetter," and perhaps others—I don't have a complete list. Don't remove Silverlight if you use the "Netflix" video-streaming service.
Step 6
Do as in Step 4 with this line:
~/Library/Internet Plug-ins
If you don’t like the results of this procedure, restore the items from the backup you made before you started. Relaunch Safari.

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Partly great news Stuart, thanks!
No idea how ZeoBit gets away with this slime ware.
There are many good 3ed party Disk/maintenance apps like DiskWarrior, DRive Genius, & maybe even TechTool, but for free...
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http://www.macupdate.com/info.php/id/15667/applejack
After installing, reboot holding down CMD+s, (+s), then when the DOS like prompt shows, type in...
applejack AUTO
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Correct any Disk problems.
Repair Permissions.
Clear out Cache Files.
Repair/check several plist files.
Dump the VM files for a fresh start.
Trash old Log files.
First reboot will be slower, sometimes 2 or 3 restarts will be required for full benefit... my guess is files relying upon other files relying upon other files! :-)
Disconnect the USB cable from any Uninterruptible Power Supply so the system doesn't shut down in the middle of the process.
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Hi there,
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''Removed stray text from copy/paste error.''

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I can no longer open .pdf files in Firefox 4

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