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Firefox does not open (no error messages) but shows up in background process

已張貼

I have tried uninstalling Firefox and reinstalling. Tried holding shifting and clicking the firefox app button to start in safe mode. Doesn't work.

This behavior started after I signed up for Firefox Sync so I suspect it has something to do with that. After reinstalling I tried deleting xulstore.json in %APPDATA%\Mozilla\Firefox\Profiles but still firefox won't open. Any ideas?

I have tried uninstalling Firefox and reinstalling. Tried holding shifting and clicking the firefox app button to start in safe mode. Doesn't work. This behavior started after I signed up for Firefox Sync so I suspect it has something to do with that. After reinstalling I tried deleting xulstore.json in %APPDATA%\Mozilla\Firefox\Profiles but still firefox won't open. Any ideas?

被選擇的解決方法

Hi, try ending the process in the Task Manager (Ctrl+Shift+Esc), then do 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. 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 that doesn't work, see if it will start with your security program (anti-virus) temporarily disabled - something in there may be interfering.

從原來的回覆中察看解決方案 1

額外的系統細節

應用程式

  • User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36

更多資訊

FredMcD
  • Top 10 Contributor
4272 個解決方法 59922 個答案

What's your computer system and Firefox version?

Some problems occur when your Internet security program was set to trust the previous version of Firefox, but no longer recognizes your updated version as trusted. Now how to fix the problem: To allow Firefox to connect to the Internet again;

  • Make sure your Internet security software is up-to-date (i.e. you are running the latest version).
  • Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see

Configure firewalls so that Firefox can access the Internet. {web link}

What's your computer system and Firefox version? Some problems occur when your Internet security program was set to trust the previous version of Firefox, but no longer recognizes your updated version as trusted. Now how to fix the problem: To allow Firefox to connect to the Internet again; * Make sure your Internet security software is up-to-date (i.e. you are running the latest version). * Remove Firefox from your program's list of trusted or recognized programs. For detailed instructions, see '''[https://support.mozilla.org/en-US/kb/configure-firewalls-so-firefox-can-access-internet Configure firewalls so that Firefox can access the Internet.]''' {web link}

提出問題者

I have windows 10 on a lenovo y410p and not sure where to find the firefox version but I downloaded the most recent one when i tried to reinstall so I'm guessing that's 63.0.3 according to the releases page.

I tried removing firefox from the list of allowed apps on windows firewall but it won't let me remove Firefox (C:\Program Files\Mozilla Firefox)

I have windows 10 on a lenovo y410p and not sure where to find the firefox version but I downloaded the most recent one when i tried to reinstall so I'm guessing that's 63.0.3 according to the releases page. I tried removing firefox from the list of allowed apps on windows firewall but it won't let me remove Firefox (C:\Program Files\Mozilla Firefox)
FredMcD
  • Top 10 Contributor
4272 個解決方法 59922 個答案

What happens? What is the exact error messages?

What happens? What is the exact error messages?

提出問題者

Sorry should have been more clear, when trying to remove Firefox from the list of allowed apps on windows firewall, the remove button is grayed out even after I clicked change settings. Although I have two instances of Firefox in the list of allowed apps probably because I tried to add it earlier. One is checked private and one public.

Trying to open firefox again just gives me the idle cursor then nothing happens.

Sorry should have been more clear, when trying to remove Firefox from the list of allowed apps on windows firewall, the remove button is grayed out even after I clicked change settings. Although I have two instances of Firefox in the list of allowed apps probably because I tried to add it earlier. One is checked private and one public. Trying to open firefox again just gives me the idle cursor then nothing happens.
FredMcD
  • Top 10 Contributor
4272 個解決方法 59922 個答案

Remove the other entry. Then try again.

Remove the other entry. Then try again.

提出問題者

The other entry's "remove" button is also grayed out unfortunately.

The other entry's "remove" button is also grayed out unfortunately.
FredMcD
  • Top 10 Contributor
4272 個解決方法 59922 個答案

Start your Computer in safe mode with network support. Then try the firewall.

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

Start your '''Computer''' in safe mode with network support. Then try the firewall. http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia

提出問題者

So after restarting in safe mode with network support, I checked the list of allowed apps through windows defender firewall. The "remove" buttons are still grayed out for the firefox entries.

So after restarting in safe mode with network support, I checked the list of allowed apps through windows defender firewall. The "remove" buttons are still grayed out for the firefox entries.
Scribe 733 個解決方法 3484 個答案

選擇的解決方法

Hi, try ending the process in the Task Manager (Ctrl+Shift+Esc), then do 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. 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 that doesn't work, see if it will start with your security program (anti-virus) temporarily disabled - something in there may be interfering.

Hi, try ending the process in the Task Manager (Ctrl+Shift+Esc), then do 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. 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 that doesn't work, see if it will start with your security program (anti-virus) temporarily disabled - something in there may be interfering.

提出問題者

So I deleted files in C:\Program Files and C:\Program Files (x86) and then reinstalled Firefox. I also turned off windows defender real time virus tracking and then tried to start firefox in safe mode (hold shift and start firefox). Now it seems to work!

I turned on windows defend antivirus again and firefox now still loads so I'm not sure if it was the antivirus.

Thanks for the help.

So I deleted files in C:\Program Files and C:\Program Files (x86) and then reinstalled Firefox. I also turned off windows defender real time virus tracking and then tried to start firefox in safe mode (hold shift and start firefox). Now it seems to work! I turned on windows defend antivirus again and firefox now still loads so I'm not sure if it was the antivirus. Thanks for the help.