Firefox doesn't open, update, or uninstall, what should I do?

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  2. install 10.11.4 combo update.

  https://support.Apple.com/kb/DL1869?viewlocale=en_US & local = en_US

• I can't open my mail. What should I do?

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• I can't open, update, or uninstall Firefox

  I couldn't open Firefox, so I tried to upgrade to the latest version. I get the message that I have to close Firefox to continue. The problem is that Firefox is not open. I get the same message when I tried to uninstall.

  Hello

  Can you post the exact error message?  That would make it easier to help.
  

  Thank you

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• All of a sudden I can't launch firefox, message says: unable to load XPCOM, what should I do?

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  This may be caused by an update of Firefox failure that left you with a mixture of old and update files in the Firefox program folder.

  Do a clean reinstall and delete the program folder before Firefox to (re) install a new copy of the current version of Firefox.

  • Download the full Firefox installation program and save the file to the desktop
    https://www.Mozilla.org/en-us/Firefox/all/

  If possible to uninstall your current version of Firefox to clean the Windows registry and settings in the security software.

  • Do NOT remove the "personal data" when you uninstall your current version of Firefox, because this will remove all profile folders and you lose personal data such as bookmarks and passwords including data profiles created by other versions of Firefox.

  Delete the program folder Firefox before installing newly downloaded copy of the Firefox installer.

  • (32-bit Windows) "C:\Program Files\Mozilla Firefox\"
  • (Windows 64 bit) "C:\Program Files (x 86) \Mozilla.
  • It is important to remove the Firefox program folder to delete all the files and make sure that there is no problem with the files that were the remains after uninstallation.
  • http://KB.mozillazine.org/Uninstalling_Firefox

  Your bookmarks and other personal data are stored in the Firefox profile folder and will not be affected by a uninstall and (re) install, but do NOT delete personal data when you uninstall Firefox which removes all Firefox profile folders and you lose your data.

  • http://KB.mozillazine.org/Profile_folder_-_Firefox
  • http://KB.mozillazine.org/Profile_backup
  • http://KB.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

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  reset your preferences-

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  Illustrator: http://helpx.adobe.com/illustrator/using/setting-preferences.html

  InDesign: https://forums.adobe.com/thread/526990

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  Muse (mac): https://forums.adobe.com/thread/1246022?tstart=0

  Photoshop: https://forums.adobe.com/thread/375776

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  First pro: http://www.mediacollege.com/adobe/premiere/pro/troubleshooter/trash-preferences.html

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• I can't watch a DVD on my laptop, he said: I need to update my codec, what should I do?

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  WHEN I TRY TO WATCH a MOVIE (DVD) on my laptop, it does not. He tells me that my codec is out of date, and my Windows Movie Player needs to be updated... What should I do? What is a codec?

  Download and install the codecs here

  You can also try VLC Player, it's free too.

• Firefox doesn't open PDF - I tried most of the help topic, nothing has worked

  For a week or more, FireFox wasn't able to open pdf files in the browser. The page is empty, nothing happens. Im still able to click with the right button on a pdf file and make a backup action if.
  Ive read several other subjects and tried some things like change the preferences on what program should open the pdf file, or how it must be open (or rather save as). None of them worked.

  One solution, I have not tried, that might work, but should be my last resort, would be to uninstall and reinstall FF.
  We hope to see if anyone has a tip about thow to change this.

  Note: there is no if long I updated Adobe version (v2015), which is actually named "Adobe Acrobat Reader DC" now.

  • The problems of Firefox in Mode safe
  • Troubleshoot extensions, themes, and issues of hardware acceleration to resolve common problems of Firefox

  These have?

• 28 Firefox doesn't open MP3 in the default player

  I have the options set to open MP3 files on a separate drive - I got it like that for years. Now with the new update, when I click on an MP3 link, it only opens with a player in Firefox. This is a really annoying feature, because it takes away you from the page where you were to open the player. I have to be able to stay on the page while playing MP3.

  Please tell me how to solve this problem!

  Perhaps the player is using DirectShow as a relief when Media Foundation is disabled? You could try toggling the preference of media.directshow.enabled from true to false. (I don't know what else it could affect).

• Why Firefox doesn't open Foxit Reader in its own window?

  When you navigate with Frefox, I used to be able to click on a PDF link and Foxit Reader to open the file in a separate window (Foxit). Now no matter what I do, the PDF opens in Firefox in what I assume is a reader of PDF in Firefox.

  How canI do this job like her?

  Could you try the steps in this article to support and see if they solve the problem: How to disable the built-in PDF Viewer and use another Viewer.

• Why Firefox doesn't open the printer dialog box whenever it starts

  When Firefox opens the printer dialog box opens automatically - why and how can I make sure that he does this.
  This never used to happen on previous versions of firefox

  Some web pages automatically shows the print dialog box. In particular, the pages Web sites have specially formatted for printing can do.

  Restore you tabs that you have opened previously, or commissioning with your home page (s)? I suspect that one of them generates the dialog box. You can view by clicking on each of them and reload the page to see if it's on this page.

• Why Firefox doesn't open mobile Web sites on my desktop?

  Some sites Web is open in a mobile form, on my desk, no matter how I try to achieve this, favorite web, e-mail etc. link search. PayPal and Sony are two that I can't open. I have to switch to IE to be able to use these sites. Go to PayPal takes me here, https://mobile.paypal.com/us/cgi-bin/wapapp?cmd=_wapapp-homepage, Sony here, http://m.sony.com/, no matter how, I try to go there or what I put in the address bar.

  I had the same problem and I fixed it by following action
  Type ' topic: config' in the url
  Accept 'I promise I'll be careful. "
  Under type of filter: wml
  Preference name: network.http.accept.default
  Right-click on the value and select "Reset".

  Enjoy!