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Why can I no longer use manual proxy settings on Firefox?

  • 3 个回答
  • 1 人有此问题
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  • 最后回复者为 cor-el

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I used to access Firefox by using manual proxy settings but as of this week, I can no longer change anything on the Connection Settings tab. It stays on "Use system proxy settings" as a default. How can I change it back to Manual Proxy configuration as Firefox is not allowing me to move on to any other buttons. It will not allow me to click on any of the other buttons such as "No Proxy" etc. It will not move from "Use system proxy settings". Please advise. I am using a Windows 10 PC.

I used to access Firefox by using manual proxy settings but as of this week, I can no longer change anything on the Connection Settings tab. It stays on "Use system proxy settings" as a default. How can I change it back to Manual Proxy configuration as Firefox is not allowing me to move on to any other buttons. It will not allow me to click on any of the other buttons such as "No Proxy" etc. It will not move from "Use system proxy settings". Please advise. I am using a Windows 10 PC.

所有回复 (3)

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This behavior isn't normal. I think something went wrong with your Firefox settings and your best option is to refresh Firefox, following the below directions.


The Refresh feature (called "Reset" in older Firefox versions) can fix many issues by restoring Firefox to its factory default state while saving your bookmarks, history, passwords, cookies, and other essential information.

Note: When you use this feature, you will lose any extensions, toolbar customizations, and some preferences. See the Refresh Firefox - reset add-ons and settings article for more information.

To Refresh Firefox:

  1. Open the Troubleshooting Information page using one of these methods:
    • Click the menu button New Fx Menu, click help Help-29 and select Troubleshooting Information. A new tab containing your troubleshooting information should open.
    • If you're unable to access the Help menu, type about:support in your address bar to bring up the Troubleshooting Information page.
  2. At the top right corner of the page, you should see a button that says "Refresh Firefox" ("Reset Firefox" in older Firefox versions). Click on it.
  3. Firefox will close. After the refresh process is completed, Firefox will show a window with the information that is imported.
  4. Click Finish and Firefox will reopen.

Did this fix the problem? Please report back to us!

Let me know if this helps.

由mattcamp于修改

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Do a clean reinstall of the current Firefox release and delete the Firefox program folder before installing a fresh copy of the current Firefox release.

If possible uninstall your current Firefox version to cleanup the Windows Registry and settings in security software.

  • do NOT remove "personal data" when you uninstall the current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including data in profiles created by other Firefox versions

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

  • (64 bit Firefox) "C:\Program Files\Mozilla Firefox\"
  • (32 bit Firefox) "C:\Program Files (x86)\Mozilla Firefox\"

Your personal data like bookmarks is stored in the Firefox profile folder, so you won't lose personal data when you uninstall and reinstall or update Firefox, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.

If you keep having problems then create a new profile to test if your current profile is causing the problem.


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Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
  • do NOT click the "Refresh Firefox" button on the Safe Mode start window

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