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Firefox won't open, and re-installing didn't help.

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Firefox froze while I was using it, and I couldn't do anything so I shut off the computer. Now when I try to open it, nothing happens. The task manager shows the program as running when I uninstall it, so I shut it off, re-install, same problem. I've restarted and shut down the computer, uninstalled and reinstalled repeatedly, and I'm out of ideas. My other browsers work. Windows also did an update recently. I'm using Windows 10. I read that I needed to erase some program files but they were already gone. What should I do? I appreciate any advice you may have on this matter. Thanks!

Firefox froze while I was using it, and I couldn't do anything so I shut off the computer. Now when I try to open it, nothing happens. The task manager shows the program as running when I uninstall it, so I shut it off, re-install, same problem. I've restarted and shut down the computer, uninstalled and reinstalled repeatedly, and I'm out of ideas. My other browsers work. Windows also did an update recently. I'm using Windows 10. I read that I needed to erase some program files but they were already gone. What should I do? I appreciate any advice you may have on this matter. Thanks!

Chosen solution

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?


Start your Computer in safe mode with network support. Then start Firefox. Try Safe websites. Is the problem still there?

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia

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Additional System Details

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  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36 Edge/16.16299

More Information

FredMcD
  • Top 10 Contributor
3706 solutions 50992 answers

Download Firefox For All languages And Systems {web link}

Save the file. Then Close Firefox. +++++++++++++++++++++++++++++++++++++ Start your Computer in safe mode and try this.

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode This shows how to Start all Computers in Safe Mode; Free Online Encyclopedia ++++++++++++++++++++++++++++++++++++++ Let’s do a full clean re-install;

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.

[http://www.mozilla.org/en-US/firefox/all/ Download Firefox For All languages And Systems] {web link} Save the file. Then '''Close Firefox. ''' +++++++++++++++++++++++++++++++++++++ Start your '''Computer''' in safe mode and try this. http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode This shows how to Start all Computers in Safe Mode; Free Online Encyclopedia ++++++++++++++++++++++++++++++++++++++ Let’s do a full clean re-install; 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.
Pkshadow
  • Top 10 Contributor
1056 solutions 14618 answers

uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files and C:\Program Files(x86) Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do : https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

Reinstall with Current Release Firefox 57.0.2 with a Full Version Installer https://www.mozilla.org/firefox/all/

Important to delete the Folders in those locations if not being uninstalled. Also to use the installer from above.

If still issues create a New Profile : https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

Please let us know if this solved your issue or if need further assistance.

uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files and C:\Program Files(x86) Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do : https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer Reinstall with Current Release Firefox 57.0.2 with a Full Version Installer https://www.mozilla.org/firefox/all/ Important to delete the Folders in those locations if not being uninstalled. Also to use the installer from above. If still issues create a New Profile : https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles Please let us know if this solved your issue or if need further assistance.
FredMcD
  • Top 10 Contributor
3706 solutions 50992 answers

Helpful Reply

Didn't I already post that?

Didn't I already post that?

Helpful Reply

I uninstalled firefox, and there were no program files to delete, or any files related to firefox in my computer. I downloaded from your link, restarted in safe mode, and re-installed. It didn't work. What should I try next?

I uninstalled firefox, and there were no program files to delete, or any files related to firefox in my computer. I downloaded from your link, restarted in safe mode, and re-installed. It didn't work. What should I try next?
FredMcD
  • Top 10 Contributor
3706 solutions 50992 answers

Chosen Solution

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?


Start your Computer in safe mode with network support. Then start Firefox. Try Safe websites. Is the problem still there?

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia

[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode 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? ----------------- Start your '''Computer''' in safe mode with network support. Then start Firefox. Try '''Safe''' websites. Is the problem still there? http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia

Question owner

Starting Firefox in safe mode worked. Thank you for your time and assistance! I appreciate it.

Starting Firefox in safe mode worked. Thank you for your time and assistance! I appreciate it.
FredMcD
  • Top 10 Contributor
3706 solutions 50992 answers

It could be the work of one of your add-ons. Type about:addons<enter> in the address bar to open your Add-ons Manager. Hot key; <Control> (Mac=<Command>) <Shift> A)

In the Add-ons Manager, on the left, select Extensions. Disable a few add-ons, then Restart Firefox.

Some added toolbar and anti-virus add-ons are known to cause Firefox issues. Disable All Of them.

If the problem continues, disable some more (restarting FF). Continue until the problem is gone. After, you know what group is causing the issue. Re-enable the last group ONE AT A TIME (restarting FF) until the problem returns.

Once you think you found the problem, disable that and re-enable all the others, then restart again. Let us know who the suspect is, detective.

It could be the work of one of your add-ons. Type '''about:addons'''<enter> in the address bar to open your Add-ons Manager. Hot key; '''<Control> ''(Mac=<Command>)'' <Shift> A) ''' In the Add-ons Manager, on the left, select '''Extensions. ''' Disable a few add-ons, then '''Restart Firefox. ''' Some added toolbar and anti-virus add-ons are known to cause Firefox issues. '''Disable All Of them. ''' If the problem continues, disable some more (restarting FF). Continue until the problem is gone. After, you know what group is causing the issue. Re-enable the last group '''ONE AT A TIME''' (restarting FF) until the problem returns. Once you think you found the problem, disable that and re-enable all the others, then restart again. Let us know who the suspect is, detective.