Firefox will not open a site because it thinks it is not trustworthy, but it has previously done so.

When I try to open a previously trusted site to make an appointment on line with my doctor Firefox says that it is not to be trusted. I then used IE to go to the site and it allowed me access.
Please can you advise me as to how I can overcome this problem.
I have tried different things from your help pages but there are too many alternatives and it becomes confusing. This is the error message:
www.tramita.gva.es uses an invalid security certificate.
The certificate is not trusted because no issuer chain was provided.
(Error code: sec_error_unknown_issuer)

You can retrieve the certificate to check who issued the certificate.
You should always do that to see if that helps to identify the problem (missing intermediate certificate or something else).
*Click the link at the bottom of the error page: "I Understand the Risks"
Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate".
*Click the "View..." button to inspect the certificate and check who is the issue.
If you can't add an exception, but get a pop-up with the error message then you can check the pref [http://kb.mozillazine.org/browser.xul.error_pages.enabled browser.xul.error_pages.enabled] on the about:config page and make sure that the value is set to the true (default).
See http://kb.mozillazine.org/about%3Aconfig

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Firefox will not start unless reboot has been done. If start is attempted, Firefox gets hung up, cannot close or log off from Windows.

I can start Firefox when I have just rebooted. If I close Firefox and come back later and try to restart Firefox, it tries to start but never does. A Control/Alt/Delete shows that it is running, but it does not load the screen. I cannot turn Firefox off or log off from Windows.

I can start Firefox when I have just rebooted. If I close Firefox and come back later and try to restart Firefox, it tries to start but never does. A Control/Alt/Delete shows that it is running, but it does not load the screen. I cannot turn Firefox off or log off from Windows.

I'm on a mac, version 10.5.8, and firefox will not download. It has a prohibit sign over it, and says 'cannot be supported with this architecture'

I'm on a mac, version 10.5.8, and firefox will not download. It has a prohibit sign over it, and says 'cannot be supported with this architecture'

Firefox 4 versions and later do not run on a PowerPC Mac.<br />
Firefox 4 and later require at least OS X 10.5 and an Intel Mac.
* http://www.mozilla.com/firefox/6.0/system-requirements/
For an unofficial Firefox 7 compatible version (TenFourFox) that runs on PowerPC Macs with OS X 10.4.11 or OS X 10.5.8 you can look at:
* http://www.floodgap.com/software/tenfourfox/
* http://www.macupdate.com/app/mac/37761/tenfourfox
Firefox 3.6.x (Mac OS X 10.4 and later) can be found here:
* http://www.mozilla.com/en-US/firefox/all-older.html

Firefox will not launch, but shows in task manager, after updating graphics drivers to AMD's 13.1.

Hi,
After updating to the AMD 13.1 drivers, on my 5770, Firefox will not launch; it does, however, show in the task manager. I should note that it will start in Windows safe mode; when I had it open in safe mode, I used that time to disable all plugins, add-ons, extensions, and created a new profile. This did not help. I also tried launching Firefox in to its safe mode, and had no luck with this either.
I experienced this problem once before, when trying to update to a previous version. I believe I was moving from 12.1 to 12.4, but I'm not 100% sure of that. Ultimately, my solution then was to retrograde back to my previous driver. The steps mentioned in the previous paragraph did not help at that time, not did a complete reinstall.
15 years of computer repair experience, and this has me baffled.
Thank you to anyone who might be able to help.
Possibly relevant specs.
Windows 7 Ultimate x64
AMD Phenom II x4
6BG Ram
AMD 5770 graphics, running Catalyst 13.1

By any chance, did you disable Firefox's use of hardware graphics acceleration? To avoid a round-trip through Windows Safe Mode, you could try adding these to your prefs.js file while Firefox is closed.
To quickly open the folder with the correct prefs.js file, you can use
Help > Troubleshooting Information > "Show Folder" button
Because Firefox may overwrite change to this file at shutdown, you should edit it after closing Firefox and allowing a few moments for Firefox to finish updates to the files.
These are the preferences I think are most relevant:
user_pref("gfx.content.azure.enabled", false);
user_pref("gfx.direct2d.disabled", true);
Does that make any difference?

Firefox will not load webpages and has trouble quiting

Recently, firefox has randomly stopped being able to load pages as if the wireless was not work (redirected to the cannot find server page). I would think this was a problem with the internet, but when I restart my wireless it is not fixed and my other browsers do not see the same issue. When I restart firefox it works again, but I usually have to do this several times a day. Another issue, firefox will not quit when I do command Q. The window will close but the application will not quit, and I have to go and force quit it. Background info, using Macbook, wireless internet, firefox is up to date. Thanks for your help.

Hello!
Please provide the following information to better assist you: <br>
*Firefox version
*Operating system

Firefox will not load but other browsers will. Task master does not show it's open and it will not load even if I reboot.

The cursor continues to spin then stops. Will not load.

Open the Windows Task Manager > Processes Tab and see if there is a '''firefox.exe''' process running, when you can't open Firefox and you find it necessary ti restart your PC. When you try to open Firefox and a firefox.exe process is "hung", you should get a warning message that ''' "Firefox is already running" '''.

After I connect an ipod thro a usb cable, firefox will not load, but other browsers work fine.?

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Open the Windows Task Manager > Processes Tab and see if there is a '''firefox.exe''' process running, when you can't open Firefox and you find it necessary ti restart your PC. When you try to open Firefox and a firefox.exe process is "hung", you should get a warning message that ''' "Firefox is already running" '''.

Firefox will not load, but shows in task manager

Sometimes when I try to open firefox the program will not open, but it appears in task manager.
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Then I have to reboot for it to open. I was using ver 36.0.0.4 then upgraded to 37 with no change.
I went back to ver 28 and tried it and it worked, but I did not try that many times.
It will work for 4 or 5 times then stop working and I have to reboot.
I am using windows 7 32 bit.

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
Profile Backup and Restore
http://kb.mozillazine.org/Profile_backup
https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Sometimes FireFox will not start up

if my laptop stays on for a few days, firefox will not restart if it has stopped. I have to cold reboot and then usually it will start up.
sometimes I have to reboot twice to get it to run.

Make sure that Firefox is completely closed, when you try to run the profile manager.
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Firefox will not open ANY site. Wont work AT ALL. Nothing seems to be working.

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Looks like a bunch of people have this problem. Anyone got any ideas to fix this???

When I am NOT private browsing Firefox will not allow me to delete or change the website address in the location bar. My only remedy is to open a new window and search in google then click the link to that site through google. How can I resolve this?

Question
When I am NOT private browsing Firefox will not allow me to delete or change the website address in the location bar. My only remedy is to open a new window and search in google then click the link to that site through google. When I swap to private browsing firefox allows me to anter the website address directly into the location bar - but this is a slow [prcess to swap back and forth - also by dint of using private browsing I loose my website information.

Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

Firefox will not open because of this error message...[JavaScript Application] Error on switching in renew: NS_ERROR_UNEXPECTED, Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getCharPref]

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Some how I solved my problem by opening a user account and downloading Firefox 4.0 beta and installing it, I did try it, worked fine, so I did close the user account and did go back to my own account(switched user), the main page that I had problem with Firefox which would not open, I dabble click on Firefox it start working again!! I hope that solves your problem too.
firefox will not open, it gives me this cod and would not turn off, Error on switching in renew: NS_ERROR_UNEXPECTED, Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getCharPref] id: none

Firefox will not open. Unable to uninstall because message says Firefox is running. How do I turn it off?

I upgraded Firefox after upgrading to windows 8.1 now firefox will not open but when I try to uninstall the program I get a popup telling me to close firefox. The task manager says nothing is running. Help.

Try restart your computer then try unistall, then get the most recent version here:
*[http://www.mozilla.org/en-US/firefox/all/ Last Firefox]
*[https://support.mozilla.org/en-US/kb/install-firefox-windows Install Firefox]
Also:
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Safari AND Firefox will not open Flickr or Yahoo

Hi
I'm running MAC OS X 10.7.5, Safari version 6.1.3 and Firefox 29.0.1.
Both Flickr and any related Yahoo page will NOT open on either browser.
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When I try Yahoo the Yahoo home page loads but everything is in blue text and a very basic version. If I click on any of the links the same error messages as above show up.
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Clearing out caches. Regularly.
Resetting Safari
Changing the DNS settings
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Turning the Firewall off.
Turning the Firewall back on.
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Can anyone out there help? Please!!

Marwood71,
yes, Yahoo! bought Flickr back in 2005, so they are closely linked.
If you’re trying to use Flickr’s secure HTTP site, then try connecting to https://secure.flickr.com/ instead.

I started working for ChaCha, and now firefox will not work unless I manually close it in the process tree every time I want to use it. I also cannot open more than 1 page at a time.

I started working for ChaCha 11/26/2010, I had to download a program to take incoming questions.
Ever since then, Firefox will not work correctly, even if I am totally logged out of ChaCha, and the page is closed, if I try to open my browser using Firefox, it will not open, I have to go into the processor tree and manually end Firefox, then it will work, but it will only let me open 1 page at a time. For example I have Firefox open now, but if I go and click on the icon to open it in a new browser, it will not open, I either have to close this, or use IE-I HATE IE lol.
I cannot use the ChaCha add on you have because it is not for the new version of Firefox, please help, I love Firefox, but not being able to open more than one window/page at a time does not cut it, nor does having to manually stop it from processing. I have tried re-installing it too.
Thank you, Melinda

I should add that I face the same problem with Safari and Google Chrome.

Firefox will not open a site because it thinks it is not trustworthy, but it has previously done so.

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