Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Firefox will not open in Windows 10 on my computer. It has worked in the past but very slow in opening.

  • 4 replies
  • 2 have this problem
  • 13 views
  • Last reply by cor-el

more options

I am running the Edge browser right now because Firefox will not open up at all. For the past couple of months Firefox has been extremely slow in opening, (approx. 5 to 10 minutes). But when open seemed to work ok. Today, I have tried multiple times for over a half day and it will not open at all.

I am running the Edge browser right now because Firefox will not open up at all. For the past couple of months Firefox has been extremely slow in opening, (approx. 5 to 10 minutes). But when open seemed to work ok. Today, I have tried multiple times for over a half day and it will not open at all.

All Replies (4)

more options

What's your computer system and Firefox version?

Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

more options

I am running a Dell Inspiron 1764 with an Intel Core i5, 64 bit processor. I am using Windows 10 for the OS.

I have tried opening Firefox in safe mode using the "shift" key and nothing happens. Since I cannot open Firefox I am having a hard time figuring out where to go to find the Firefox version. If is see it correctly it is 53.032.6333, created on 4/25/2017.

more options

Nothing at all? No error messages?

Let’s do a full clean re-install; Download Firefox For All languages And Systems {web link}

Save the file. Then Close Firefox.

Using your file browser, open the Programs Folder on your computer.

Windows: C:\Program Files C:\Program Files (x86)

Mac: Open the "Applications" folder. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac

Linux: Check your user manual. If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it. See Install Firefox on Linux; https://support.mozilla.org/en-US/kb/install-firefox-linux

If you downloaded and installed the binary package from the Firefox download page, simply remove the folder Firefox in your home directory. http://www.mozilla.org/firefox#desktop ++++++++++++++++++++++++++++ Do Not remove the profiles folder.

Look for, and rename any Mozilla or Firefox program folders by adding .old to them. Do not rename the Mozilla Thunderbird folder if there is one.

After rebooting the computer, run a registry scanner if you have one. Then run the installer. If all goes well, remove the OLD folders when you are done. +++++++++++++++++++++++++++ If there is a problem, start your Computer in safe mode and try again.

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode This shows how to Start all Computers in Safe Mode; Free Online Encyclopedia

more options

Boot the computer in Windows Safe mode with network support to see if that has effect in case security software is causing problems.

It is possible that your firewall or other security software blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program. Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access to install for Firefox and the plugin-container process and the updater process. See: