1. 重新啟動電腦

有些問題只要重新啟動電腦，再重新啟動 Firefox 就好了。

2. 清除 cookies 跟快取

Many problems with loading web pages can be resolved by clearing Firefox's cookies and cache:

3. 更新外掛程式

Sometimes plugins for Firefox (such as Adobe Reader, Flash, Java, QuickTime, RealPlayer, and Windows Media Player) can cause problems. Often this is because they are out of date. To check to see if you have the latest versions of all your plugins, go to our Plugin Check page:

1. If any of your plugins are out of date, click Update and follow the instructions for updating that plugin.
2. After you've updated all of your plugins, restart Firefox
   • 模板「closefirefox」不存在，或是沒有通過審核的版本。 Then start Firefox again.

4. 以安全模式重新啟動 Firefox

安全模式 is a troubleshooting mode that disables all extensions, uses the default theme, turns off hardware acceleration, and uses default toolbar settings and controls, among other things. To start Firefox in Safe Mode:

1. 點擊選單按鈕，點擊說明，選擇疑難排解模式…然後點擊要將 Firefox 重新啟動到疑難排解模式嗎？對話框當中的重新啟動。
   註： 你也可以按住shift鍵不放，並啟動 Firefox 按住option鍵不放，並啟動 Firefox 離開 Firefox 後，進入終端機，執行 firefox -safe-mode 指令以進入安全模式。
   （這裡有可能需指明 Firefox 的安裝路徑，例如 /usr/lib/firefox）。
2. In the Firefox Safe Mode dialog, click Continue in Safe ModeStart in Safe Mode.
3. Check whether your problem is still happening while in Safe Mode.

• If the problem still happens in Safe Mode, go on to step 5.
• If the problem does not happen in Safe Mode, see the 解決擴充套件、佈景主題以及硬體加速造成的 Firefox 常見問題 article and follow the instructions under The problem does not occur in Safe Mode to narrow down the cause.

5. 找出外掛程式造成的問題

Some problems can be caused by a plugin that no longer works with Firefox. To see if this is the issue, disable all of your plugins. If the problem goes away, it's likely that a plugin is the cause:

1. 點擊選單按鈕，然後點擊附加元件與佈景主題擴充套件和佈景主題，並選擇Plugins。
2. Click each plugin in the list and then click Disable.
3. Check whether your problem happens when you have all plugins disabled.

If your problem goes away when all of your plugins are disabled, see the 外掛程式問題排解 article to learn how to narrow down which one is causing it.

6. 重新安裝 Firefox

Some Firefox issues can be caused by a problem with one of the Firefox program files. Follow these steps to completely remove and reinstall Firefox.

Now start Firefox and check to see if your problem has been fixed. If it has, you can reinstall the extensions and themes you verified (in part 4 above) were not causing problems. If your problem hasn't been fixed continue with the next troubleshooting method.

7. 恢復 Firefox 至原廠狀態

The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information.

1. 若您正使用 Firefox 瀏覽此頁，請直接點擊 重新整理 Firefox 按鈕。
   若您使用其他瀏覽器或在行動裝置上的話則不會有作用。
   • 您也可以在 Firefox 中的 about:support，疑難排除資訊頁的最上方找到重新整理 Firefox 的按鈕。
2. 點擊開啟的確認視窗中的 重新整理 Firefox 以繼續。
3. Firefox 將會關閉，並進行重整。重設完成後，將會顯示一個視窗，列出已匯入的資訊。點擊 完成，Firefox 就會開啟。

1. 重新啟動電腦

有些問題只要重新啟動電腦，再重新啟動 Firefox 就好了。

2. 清除 cookies 跟快取

Many problems with loading web pages can be resolved by clearing Firefox's cookies and cache:

3. 更新外掛程式

Sometimes plugins for Firefox (such as Adobe Reader, Flash, Java, QuickTime, RealPlayer, and Windows Media Player) can cause problems. Often this is because they are out of date. To check to see if you have the latest versions of all your plugins, go to our Plugin Check page:

1. If any of your plugins are out of date, click Update and follow the instructions for updating that plugin.
2. After you've updated all of your plugins, restart Firefox
   • 模板「closefirefox」不存在，或是沒有通過審核的版本。 Then start Firefox again.

4. 以安全模式重新啟動 Firefox

Safe Mode is a troubleshooting mode that disables all extensions, uses the default theme, turns off hardware acceleration, and uses default toolbar settings and controls, among other things. To start Firefox in Safe Mode:

1. 點擊選單按鈕，點擊說明，選擇疑難排解模式…然後點擊要將 Firefox 重新啟動到疑難排解模式嗎？對話框當中的重新啟動。
   註： 你也可以按住shift鍵不放，並啟動 Firefox 按住option鍵不放，並啟動 Firefox 離開 Firefox 後，進入終端機，執行 firefox -safe-mode 指令以進入安全模式。
   （這裡有可能需指明 Firefox 的安裝路徑，例如 /usr/lib/firefox）。
2. In the Firefox Safe Mode dialog, click Continue in Safe Mode.
3. Check whether your problem is still happening while in Safe Mode.

• If the problem still happens in Safe Mode, go on to step 5.
• If the problem does not happen in Safe Mode, see the 解決擴充套件、佈景主題以及硬體加速造成的 Firefox 常見問題 article and follow the instructions under The problem does not occur in Safe Mode to narrow down the cause.

5. 找出外掛程式造成的問題

Some problems can be caused by a plugin that no longer works with Firefox. To see if this is the issue, disable all of your plugins. If the problem goes away, it's likely that a plugin is the cause:

1. 點擊選單按鈕，然後點擊附加元件與佈景主題擴充套件和佈景主題，並選擇Plugins。
2. Click each plugin in the list and then click Disable.
3. Check whether your problem happens when you have all plugins disabled.

If your problem goes away when all of your plugins are disabled, see the 外掛程式問題排解 article to learn how to narrow down which one is causing it.

6. 恢復 Firefox 原始設定

Some problems can be fixed by resetting your Firefox preference settings:

1. 點擊選單按鈕，點擊說明，選擇疑難排解模式…然後點擊要將 Firefox 重新啟動到疑難排解模式嗎？對話框當中的重新啟動。
   註： 你也可以按住shift鍵不放，並啟動 Firefox 按住option鍵不放，並啟動 Firefox 離開 Firefox 後，進入終端機，執行 firefox -safe-mode 指令以進入安全模式。
   （這裡有可能需指明 Firefox 的安裝路徑，例如 /usr/lib/firefox）。
2. In the Firefox Safe Mode dialog, click to put a check mark by Reset all user preferences to Firefox defaults.
3. To apply your changes, click Make Changes and Restart.

7. 重新安裝 Firefox

Some Firefox issues can be caused by a problem with one of the Firefox program files. Follow these steps to completely remove and reinstall Firefox.

Now start Firefox and check to see if your problem has been fixed. If it has, you can reinstall the extensions and themes you verified (in part 4 above) were not causing problems. If your problem hasn't been fixed continue with the next troubleshooting method.

8. 開一個新的設定檔

A bad profile can cause all kinds of problems with Firefox. To see whether your problem is caused by a bad profile, make a new one. If that fixes the problem, you can copy your data (bookmarks, saved passwords, etc.) over to the new profile.

1. Use the instructions in the 使用設定檔管理員建立或移除 Firefox 設定檔 article to start the Profile Manager and create a new profile.
   When creating a new profile, do not delete your old profile. You will lose all of your bookmarks, history, passwords and settings.
2. Once you've created a new profile, select it in the Profile Manager and click Start Firefox.

Test to see if your problem occurs with the new profile. If it doesn't, you can copy your data to the new profile - see 從舊的個人設定檔還原重要資料 for instructions.

其他方案

If you've tried all of these troubleshooting methods and you're still having problems the issue may be with other software or your Windows system.

檢查是否與網路資安軟體有所衝突

Some Internet security software (including antivirus, antispyware, and firewall programs) can cause problems with Firefox including blocking it from opening websites, crashes, and more. Often you can open the program's settings, remove Firefox from its list of allowed or trusted programs and it will be re-detected and things should start working again. If your program is listed at the 設定防火牆使 Firefox 能夠存取網際網路 article, you can get specific instructions for how to properly reconfigure it.

掃描電腦病毒與間諜程式

Periodically, you should scan your system for viruses, spyware, or other malware. These free services are often useful:

• Malwarebytes
• Microsoft Security Essentials

檢查硬碟是否有錯誤

A problem with your computer's hard drive may prevent Firefox from running. Here are instructions for checking your hard drive:

• How to perform disk error checking in Windows XP on microsoft.com.
• Check your hard disk for errors on Windows Vista / 7 on microsoft.com.