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Firefox will not open even after reinstall

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The latest Windows updates are killing me. Firefox, after reinstalling last week, wouldn't open. I uninstalled and reinstalled but still a problem It's in the Task Bar, but will not open. I've lost all of my bookmarks now and I'm frustrated. How do I fix?

The latest Windows updates are killing me. Firefox, after reinstalling last week, wouldn't open. I uninstalled and reinstalled but still a problem It's in the Task Bar, but will not open. I've lost all of my bookmarks now and I'm frustrated. How do I fix?

Chosen solution

I have the impression that moderators keep sending us "copy and paste" templated answers. We tell them: "they did not work" and nevertheless they send us more "copy and paste" replies. Nobody or very few seem to sit and give a customised written from scratch response. Sad.

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Additional System Details

Application

  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/18.17763

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Scribe 725 solutions 3456 answers

Hi, hold down the Shift key when you start Firefox to start in Safe Mode. More - Troubleshoot Firefox issues using Safe Mode.

If it works in Safe Mode, disable any theme and extensions - 3-bar menu > Add-ons > Themes/Extensions and restart Firefox; if it's OK, re-enable them one by one until you find the culprit. You may need to restart Firefox after enabling some extensions.


If that doesn't work, try a Clean Reinstall; this means you remove your Firefox program files and then reinstall Firefox. This process does not remove your Firefox profile data (such as bookmarks and passwords), since that information is stored in a different location. With Firefox closed, use another browser to download Firefox from https://www.mozilla.org/en-US/firefox/all/ and save the file to somewhere convenient on your computer.

Now delete the Firefox installation folder which should be in one of the following locations -

C:\Program Files\Mozilla Firefox C:\Program Files (x86)\Mozilla Firefox

You can now double click the file you previously downloaded to install Firefox.

If your question is resolved by this or another answer, please help other users by marking the best reply as Solved. Thank you!

Hi, hold down the Shift key when you start Firefox to start in Safe Mode. More - [[Troubleshoot Firefox issues using Safe Mode]]. If it works in Safe Mode, disable any theme and extensions - 3-bar menu > Add-ons > Themes/Extensions and restart Firefox; if it's OK, re-enable them one by one until you find the culprit. You may need to restart Firefox after enabling some extensions. --------------------------------------- If that doesn't work, try a Clean Reinstall; this means you remove your Firefox program files and then reinstall Firefox. This process does not remove your Firefox profile data (such as bookmarks and passwords), since that information is stored in a different location. With Firefox closed, use another browser to download Firefox from https://www.mozilla.org/en-US/firefox/all/ and save the file to somewhere convenient on your computer. Now delete the Firefox installation folder which should be in one of the following locations - C:\Program Files\Mozilla Firefox C:\Program Files (x86)\Mozilla Firefox You can now double click the file you previously downloaded to install Firefox. ''If your question is resolved by this or another answer, please help other users by marking the best reply as Solved. Thank you!''
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Question owner

I tried the Uninstall and Reinstall and the result is the same: The Firefox icon appears in the task bar at the bottom of the screen. When I click on it it opens, but still in the Task Bar, making it useless. How do I get Firefox to open in the regular screen?

I tried the Uninstall and Reinstall and the result is the same: The Firefox icon appears in the task bar at the bottom of the screen. When I click on it it opens, but still in the Task Bar, making it useless. How do I get Firefox to open in the regular screen?
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My_Cheese_Is_Slippin'
  • Top 10 Contributor
35 solutions 405 answers

Hello AXtel17664, It sounds like your quick launch shortcut is somehow corrupted. Navigate to :

C:\Users\<YourName>\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar

and delete the quick launch shortcut. Then create a new shortcut and pin it to your taskbar.

Note: the AppData folder is a hidden folder. You may need to change your View setting in windows explorer.

Hello AXtel17664, It sounds like your quick launch shortcut is somehow corrupted. Navigate to : C:\Users\<YourName>\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar and delete the quick launch shortcut. Then create a new shortcut and pin it to your taskbar. Note: the AppData folder is a hidden folder. You may need to change your View setting in windows explorer.
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Question owner

This didn't solve the problem. Why am I looking at a folder for Internet Explorer when my problem is with Firefox? All I want to do is to get Firefox to open in full screen when I click on the icon on my main screen or in the task bar.

This didn't solve the problem. Why am I looking at a folder for Internet Explorer when my problem is with Firefox? All I want to do is to get Firefox to open in full screen when I click on the icon on my main screen or in the task bar.
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gcascardo 1 solutions 10 answers

Hi I have same problem. In fact I opened a post for same issue a couple of hours ago and the suggestion is to do a clean install as well. I click on the Firefox icon in the task bar, in the start menu or a shorcut on the desktop and the result is ever the same: FIREFOX does not open.

Flipping hell, its quality degrades by the minute. At least I am not the only one! If that is some comfort......

Hi I have same problem. In fact I opened a post for same issue a couple of hours ago and the suggestion is to do a clean install as well. I click on the Firefox icon in the task bar, in the start menu or a shorcut on the desktop and the result is ever the same: FIREFOX does not open. Flipping hell, its quality degrades by the minute. At least I am not the only one! If that is some comfort......

Modified by gcascardo

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cor-el
  • Top 10 Contributor
  • Moderator
17334 solutions 156710 answers

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

See:

You can try to create a new profile to test if your current profile is causing the problem.

See "Creating a profile":

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.

It is possible that your firewall or other security software blocks or restricts Firefox without informing you, possibly after detecting changes (update) to the Firefox application. Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access for Firefox and the plugin-container process and the updater process. See: *https://support.mozilla.org/en-US/kb/server-not-found-connection-problem *https://support.mozilla.org/en-US/kb/Firewalls *https://support.mozilla.org/en-US/kb/fix-problems-connecting-websites-after-updating You can try to create a new profile to test if your current profile is causing the problem. See "Creating a profile": *https://support.mozilla.org/en-US/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 files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems. *https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile
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gcascardo 1 solutions 10 answers

Chosen Solution

I have the impression that moderators keep sending us "copy and paste" templated answers. We tell them: "they did not work" and nevertheless they send us more "copy and paste" replies. Nobody or very few seem to sit and give a customised written from scratch response. Sad.

I have the impression that moderators keep sending us "copy and paste" templated answers. We tell them: "they did not work" and nevertheless they send us more "copy and paste" replies. Nobody or very few seem to sit and give a customised written from scratch response. Sad.
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Helpful Reply

The issue was solved. My computer was overrun with adware. It not only caused this Firefox problem, but also caused Norton AntiVirus to stop working. Adware was removed and now all is back to normal.

The issue was solved. My computer was overrun with adware. It not only caused this Firefox problem, but also caused Norton AntiVirus to stop working. Adware was removed and now all is back to normal.
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My_Cheese_Is_Slippin'
  • Top 10 Contributor
35 solutions 405 answers

Hi AXtel17664, Glad to hear that your issue is resolved.

To help prevent a recurrence, can I suggest this extension:

Malwarebytes Browser Extension

Hi AXtel17664, Glad to hear that your issue is resolved. To help prevent a recurrence, can I suggest this extension: [https://addons.mozilla.org/en-US/firefox/addon/malwarebytes/?src=search Malwarebytes Browser Extension]
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gcascardo 1 solutions 10 answers

Glad to hear.

I ran a full scan using Avira Antivirus and had no detection. Are malware covered by Avira Antivirus?

If not, what anti malware can I use. The one suggested obviously I can't right now as it's an extension and FF is not opening, remember?

Glad to hear. I ran a full scan using Avira Antivirus and had no detection. Are malware covered by Avira Antivirus? If not, what anti malware can I use. The one suggested obviously I can't right now as it's an extension and FF is not opening, remember?
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