Firefox will not open a .acx file...

safari pops up the file in a separate window, firefox has me download the file and then nothing on my computer will open it...?????

I associated the .acx file with my .pdf viewer program and the file is now viewable.
Strange, but I could view .acx file if I opened it with Adobe Digital Editions.

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Firefox will not open any pdf files

FF will not open any pdf files with built in viewer or adobe. I have set applications in all different ways with no luck. PDF works with IE.
I have ff 33.1.1 and Win 7 and i have tried all suggestions concerning pdf. I even downloaded ff again, uninstalled oldff, and installed new. no luck. all i get is a pop up stating ...download is in progress, please wait.... but it never loads. started after last update. Is ther a way to delete the last update to firefox?
thanks

Hello,
In order to change the default reader for PDF files (to not open PDF files with Firefox's internal PDF reader), follow these steps:
#Click the menu button [[Image:New Fx Menu]] and click Options (Preferences for Linux and Mac).
#In the Options (Preferences for Linux and Mac) window, select the ''Applications'' panel.
#In the ''Search'' field, type ''PDF''. You should find ''Portable Document Format (PDF)''.
#On the right hand side you should find an ''Action'' column. Use that to select your favorite PDF reader. In order to view PDF files in Firefox, choose ''Preview in Firefox''.
Did this fix your problems? Please report back to us!
Thank you.

Firefox will not open my html files

In the finder, when I double click on an html file, it should open up the file in Firefox.
On my new macbook pro, after using the migration assistant, this feature did not transfer properly. I know how the "open with" system works on get info. When I change html to open with Safari, it works fine. When I change it back to Firefox, no luck.
When I double click on an html file, it opens Firefox, but the page does not load.
Other troubleshooting I have done:
Download and reinstall the latest version of Firefox
Repair permissions
Delete the old Firefox profile, and start a completely new one
Restarted several time
Done all the Apple software updates
Any other suggestions for me?
mark

Maybe this is something where either have to rebuild launch services; or there are programs or links that seem to default on their own to only use Safari (hard coded, they assume it will always be there, and will always work).
I wonder if there is an add-on system preference where you could go back to the old Internet control panel (I know someone tried to do that but gave up after it got harder with each new OS) where defaults for all file types and applications use to reside, email, ftp, http, gopher, and throw in .docx and everything but kitchen sink, maybe!)

Starting today, Firefox will not open Adobe Acrobat files in Adobe Reader, despite my putting Reader as default in Applications tab.

Until today, I had no trouble opening Adobe Acrobat files with Adobe Reader 9.5. (I need to use an old version of Adobe Reader, because I use a program called Macro Express that does not recognize later versions.) Starting this morning, when I click on an Acrobat file, I am asked which program I want to open it with. Even when I click "Do this automatically...", it doesn't do so. It asks me every time. I went into Tools, Applications, and changed all of the pdf related issues to open with Adobe Reader 9.5. This also doesn't work.

What I did was to reinstall/upgrade Adobe Reader, then there is an new option showing up in Firefox > options > applications > Portable Document Format(PDF), which is "use adobe acrobat in Firefox". Choose this one, then I managed again to open PDF files with Adobe Reader internally in Firefox.

Firefox will not open Adobe PDF files on my mini Mac (I have reader x and the latest Quicktime versions)

When I try to download a pdf file sometimes an error message appears and states can't down load file, Quicktime may need an extension. Other times the page just stays blank - nothing happens.
This happens very frequently. I can open some pdf files in Firefox. The problem appears with downloading.
I have the same software in Safari and Firefox and I do not have this problem with Safari - I can download PDFs in that browser

What I did was to reinstall/upgrade Adobe Reader, then there is an new option showing up in Firefox > options > applications > Portable Document Format(PDF), which is "use adobe acrobat in Firefox". Choose this one, then I managed again to open PDF files with Adobe Reader internally in Firefox.

Since updating last time Firefox will not open new tabs unless I right click on a link. It won't open them via file or the tab at the top of the brwoser. Anyone know how to fix this?

Since updating last time Firefox will not open new tabs unless I right click on a link. It won't open them via file or the tab at the top of the brwoser or usinf ctrl + t. Anyone know how to fix this?

I can press ctrl for a new tab but otherwise a new tab does not open. I actually need help regarding this new Synch which apparently will be in Firefox automatically in an upcoming version so I am asking how that will synch with people who use LastPass-of course because I use this very successfully and really am not eager to change the set up that I have in place at this time.
I have read through endless FAQ trying to find anyone else who has this question or concern but have found nothing. Can you please tell me how that service will get along with LastPass which does basically the same thing as Synch-it is probably spelled wrong as it looks wrong to me but if I click back to where this issue began, I will lose all of this question so please respond for the upcoming service synch.

Firefox will not open after attempting to upgrade to v5, sys restore didn't help

Was running 3.6 with no problems, but trying to upgrade today apparently broke it. The upgrade failed for some reason (the old .exe is still the only one in the Firefox folder & I can't find any files newer than April 2010 in there), but no matter how I try to run it, nothing happens - Firefox will not open, period. I tried reverting to last week with sys restore, scanning for malware with Malwarebytes, but still nothing happens. I'm using WinXP 5.1 media edition SP2 (yes, it's been around a few years but it works for me). I'm now using Chrome which seems to run just fine, tho I miss all my plugins.

Hi lwhealon
try from Start > Run > and type to check 1 of :
firefox -safe-mode
"C:\Program Files\Mozilla Firefox\firefox.exe" -safe-mode '''or'''
"C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -safe-mode
(to enable the Run box in win 7 see: [http://blogs.msdn.com/b/tims/archive/2006/09/18/windows-vista-secret-3-bringing-back-start-run.aspx enable Run box win 7] )
also check if [http://kb.mozillazine.org/Firewalls Firewall] or/and other security software blocking firefox start (like ad-blocker, web-accelerator etc).
[http://kb.mozillazine.org/Kill_application With Firefox completely closed] (probably because you can not start it), open the [http://kb.mozillazine.org/Installation_directory application folder] (by default, C:\Program Files\Mozilla Firefox on Windows) rename firefox.exe to firefox1.exe, then double-click firefox1.exe. If Firefox runs without problems, it could indicate that your firewall is blocking Firefox.
good luck

Firefox will not open after unlocking Sempron

After upgrading to a new motherboard and unlocking Sempron processor, Firefox will not open. I have tried Firefox (safe mode) and rolled back to a previous version, but to no avail. It worked fine when I ran the Sempron 140 as a single core (even overclocked to 3.17ghz) on Biostar A785GE motherboard. I cannot find a crash ID to link to.
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; (R1 1.6); Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; SLCC1; OfficeLiveConnector.1.5; OfficeLivePatch.1.3)

Maybe you restored to a version of Firefox that crashes or still have a virus problem.
(irrc some Firefox versions specifically had problems after Windows restores)
Follow up checking for malware and then try re-installing Firefox. I would also suggest you make a copy of your [[profiles|profile]] including all folders and sub files and put it somewhere safe as it may assist in restoring your bookmarks and information.
See also
*[[backing up your information]]
* [[is my firefox problem a result of malware]]
* a typical post about malware checks:<br/>[/questions/914980#answer-302372]

Firefox will not open to home page as directed in options and settings. Opening in safe mode makes no difference, either. Any ideas?

Firefox will not open to home page as set in the settings. Even in safe mode, it still will not open to home page as directed. It seems to want to open to last set of tabs, even though that is not the way it was set in settings. It seems as though the settings do not have any impact on the way it behaves!!!

Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
Do a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 20.0.x: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
*Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other profile data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

Firefox will not open,tried running profile manager but I receive a small window with the word :dialog" in it.

Firefox will not open.Tried uninstalling and reinstalling program without any success.
Tried running profile manager,but a small screen shows up with the word "dialod" in it.
Any assistance appreciated.
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; GTB0.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2; .NET4.0C; Tablet PC 2.0)

Can you provide us a screenshot?
Vista/7
Go to Start and type in Snipping Tool then provide a screenshot ,save it, and upload it to any of these file uploading websites.
[http://www.imageshack.us ImageShack]
[www.mediafire.com MediaFire]
[www.kimag.es Kimages]
XP
Press '''FN + PRT SC''' on your keyboard to take a screenshot and Press '''CTRL + V''' in Paint to paste it and save it and upload it.

Firefox will not open new 'tabs', not sure if its disabled, but does anyone know how to enable the use of my tabs?

Firefox will not open any tabs on my browser. I've tried using all alternatives to open a new tab - using the 'plus' (+) button doesn't work, 'control + T' doesn't work, going to File and clicking 'new tab' doesn't work either? Help please!

Your suggestion worked! Thanks!

Firefox will not open st george bank logon window

Firefox will not open the St George logon window. It has for morre than 5 years but in the last 48 hours it has stopped. IE and Crome still do. We have cached web content, opened Firefox in safe mode, uninstalled and reinstalled Firefox 6 times and tried many ideas other people have suggested in the online forum - seems we are not an isolated case! We are using Firefox version 19 and just about ready to uninstall it for the last time out of sheer frustration. I

Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
*Press and hold Shift and left-click the Reload button.
*Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
*Press "Command + Shift + R" (MAC)
Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
*Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*http://kb.mozillazine.org/Error_loading_websites
*http://kb.mozillazine.org/Websites_look_wrong

Firefox will not open or won't start (see /questions/964132 )

was Ok till recently

Please include more information, such as your Operating System (Windows?) and version, plus exactly what happens when you try to start Firefox. The information that's listed in a recent Firefox crash report, if available, might also help. See [[Firefox crashes]] under '''Get help fixing this crash''' and post any crash Report IDs recently submitted (they'll start with '''bp-''' )
Your question title says "Firefox will not open or won't start (see /questions/964132 )" I looked at that question and it was started by another Firefox user. [/questions/964132?page=2#answer-477049] has a number of suggestions if Firefox won't start. Which ones did you try?
For other possible solutions see
* [[Basic Troubleshooting]]
* http://kb.mozillazine.org/Browser_will_not_start_up
*[/questions/958850] ''Firefox won't open after restart''
Note: A "clean reinstall" was one of the suggestions in [/questions/964132]. It means removing the Firefox application files and then reinstalling Firefox from a fresh download, as explained in the "Reinstall Firefox" step in [[Basic Troubleshooting]]. If that allows you to start Firefox, but if the problem returns after restarting the computer, you should do another "clean reinstall" and then troubleshoot your plugins by disabling all of them, as suggested in the [[Basic Troubleshooting]] article.

Firefox will not open on my computer

From sometime last night to today (11/18) Firefox will not open when I click on the shortcut link from my desktop. I've tried to add another profile by clicking on start/run/firefox.exe but that doesn't even work. What would be the next step?

Do any error messages display when attempting to open Firefox?<br>
In the task manager, is the <code>firefox.exe</code> process running?
Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox program files and then reinstall Firefox. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#*'''Mac:''' Delete Firefox from the Applications folder.
#*'''Linux:''' If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]]. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory.
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
Please report back soon.

Firefox will not open, a pop up window message says: The application or dll mozilla firefox xul.dll is not a valid windows image. I am using XP and firefox use to work perfectly

Firefox will not open a pop up window says "the application or dll c:program files mozilla firefox xul. dll is not a valid windows range"
== This happened ==
Every time Firefox opened
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; GTB0.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)

I resolved the problem. I went to CNet and re-downloaded the upgrade. It proceeded as intended and the upgrade is installed and running with no loss of plug-ins, bookmarks, etc.

Firefox will not open a .acx file...

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