Mozilla Firefox ranks third in the list of browser users such as Google Chrome, Safari, Opera, etc. But sometimes while opening Firefox users complain with error message "Cannot load XPCOM!". This error does not allow Mozilla Firefox to open at all. If you are one of the users looking for emergency solutions, you have come to the right place.

Quick Fix——

1. Try restarting the device once. Then, try opening Firefox again.

2. Check the Internet connection.

Fix 1 – Refresh Firefox

Try refreshing Firefox before doing anything else.

1. You must press ?Win key R.

2. In the running terminal, paste this content and press Enter.

應(yīng)用程序向?qū)?/pre>
#This will open programs and features. 
3. In this list of installed applications, right-click " Mozilla Firefox (x64 en-US) " and click "Uninstall". 
4. In the Firefox Uninstaller window, click "Refresh Firefox". 
This will automatically refresh Firefox in the background. After refreshing, Firefox will open automatically. 
Test if this works. 
Fix 2 – Uninstall Firefox and perform a clean installation
The best way to resolve this issue is to uninstall Firefox from your system and reinstall it. 
Step 1 – Uninstall FIREFOX
1. The first thing you have to do is press the Windows key and X keys at the same time. 
2. Then, click "Applications and Features" to enter the settings page. 
3. When you reach the Settings window, scroll down to " Mozilla Firefox (x64 en-US)". 
You will see Mozilla Firefox in the search results. 
4. Next, click on the Three dots (?) menu and click "Uninstall". 
5. Additionally, click on "Uninstall" to completely uninstall the browser from your device. 
6. Now, click “Next” in the Firefox Uninstaller. 
#Now, follow the steps to completely uninstall Firefox from your device. 
7. After uninstalling Firefox, return to the "Settings" page. 
8. Look for the " Mozilla Maintenance Service" application. Then, click on the three-dot menu and click "Uninstall". 
9. Click "Uninstall" again. 
Then, close the settings page after uninstalling the app. 
Step 2 - Clear Temporary Files
Clearing temporary files should remove the corrupted Firefox files. 
1. First, press the Windows key and R key at the same time. 
2. Then, enter this code in the "Run" panel and press Enter key. 
C:\Users\%username%\AppData\Local\Mozilla\Firefox
[
If you are unable to access the Mozilla folder from the Run Terminal, follow these steps -
A. Open File Explorer. 
 Bay. When File Explorer opens, click the three-dot( ? ) option on the menu bar. 
C. Then, click "Options". 
d. In the Folder Options screen, go to the View tab. 
e. After that, toggle the "Show hidden files, folders and drives" menu. 
F。最后，點(diǎn)擊“應(yīng)用”和“確定”保存此修改。
這將幫助您查看隱藏的文件和文件夾。
G。然后，往這邊走——
C:\Users\你的用戶(hù)名\AppData\Local\Mozilla\Firefox
這里，“您的用戶(hù)名”代表您在系統(tǒng)上的帳戶(hù)名。
]
3.從 Firefox 文件夾中刪除所有內(nèi)容。
4.在此之后，右鍵點(diǎn)擊?Win?并點(diǎn)擊“運(yùn)行”。
5. 之后，輸入此代碼并按Enter以訪問(wèn) Temp 文件夾。
%溫度%
6. 當(dāng) Temp 文件夾打開(kāi)時(shí)，使用鼠標(biāo)選擇您在那里看到的所有內(nèi)容。
7. 之后，按“刪除”鍵從 Temp 文件夾中刪除所有內(nèi)容。
8. 在文件資源管理器屏幕中，朝這個(gè)方向前進(jìn)——
C:\Windows\Temp
9. 在這里您會(huì)注意到幾個(gè)文件夾和日志文件。選擇所有內(nèi)容并點(diǎn)擊bin 圖標(biāo)以刪除所有內(nèi)容。
完成后，關(guān)閉文件資源管理器窗口。
第 3 步 – 下載并安裝 FIREFOX
1. 現(xiàn)在，下載并安裝最新版本的Mozilla Firefox。
2. 然后，只需運(yùn)行安裝文件。
現(xiàn)在，按照屏幕上的說(shuō)明完成安裝過(guò)程。
安裝完成后，打開(kāi) Firefox 并測(cè)試它是否有效。如果“無(wú)法加載 XPCOM！” 仍然出現(xiàn)，去尋找下一個(gè)解決方案。
修復(fù) 3 – 創(chuàng)建新的 Firefox 配置文件
這可能是您的個(gè)人資料損壞的問(wèn)題。因此，您可以創(chuàng)建一個(gè)新的 Firefox 配置文件。
1. 右鍵單擊??? Win 鍵?，然后點(diǎn)擊“運(yùn)行”。
2. 此外，寫(xiě)下這個(gè)并點(diǎn)擊“?OK?”。
firefox.exe -p

3. 當(dāng) Firefox-Choose User Profile 頁(yè)面打開(kāi)時(shí)，點(diǎn)擊“?Create Profile...?”。

4. 然后，點(diǎn)擊“下一步”進(jìn)入配置文件創(chuàng)建步驟。

5. 此外，在框中寫(xiě)下您喜歡的用戶(hù)名（如 - 新用戶(hù)等）。
6. 最后，點(diǎn)擊“完成”完成該過(guò)程。

7. 完成最后一步后，確保選中“使用選定的配置文件而不在啟動(dòng)時(shí)詢(xún)問(wèn)”框。
8. 最后，點(diǎn)擊“啟動(dòng) Firefox?”立即啟動(dòng) Firefox。

啟動(dòng)后，測(cè)試瀏覽器是否正常工作。如果它工作得很好，你可以像以前一樣自由地恢復(fù)你的工作。
此外，您可以完全刪除舊配置文件并使用新配置文件以避免任何進(jìn)一步的問(wèn)題。
修復(fù) 4 – 檢查待處理的 Windows 更新
一些用戶(hù)指責(zé)此問(wèn)題的暫停 Windows 更新。
1. 打開(kāi)設(shè)置應(yīng)用程序。
2. 在左側(cè)，點(diǎn)擊“?Windows 更新”。
3.接下來(lái)，點(diǎn)擊“檢查更新”。

Windows 將檢查掛起的更新并相應(yīng)地下載它。
4. After downloading the update, click "Restart now". 

This will reboot the system and complete the installation process. 
Fix 5 – Disable third-party antivirus software
You should disable antivirus software in the background and test whether it interferes with Firefox. 
1. First, click the arrow icon on the taskbar. 
2. Then, right-click on your antivirus and click "Pause Protection" to limit the antivirus very briefly. 

Then just launch Firefox and test if it works. 
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