Mozilla Firefox Critical Error

What is Mozilla Firefox Critical Error?

If you come across Mozilla Firefox Critical Error, you should be aware it is a fictitious notification, and you should not believe a word it says. According to our researchers at, the fake warning is probably designed to scare users so that they would call the telephone number mentioned on the alert. As you see, provided you do so the cyber criminals behind this scam might convince you to let them connect to the device to fix issues remotely or suggest you buy their products. Of course, neither of these options would fix the device since there is nothing wrong with it. Thus, we advise you not to let these people scam you and try to get rid of Mozilla Firefox Critical Error as fast as possible. To help users eliminate the fake warning more quickly, we prepared deletion instructions located at the end of this report.

Where does Mozilla Firefox Critical Error come from?

Mozilla Firefox Critical Error could appear on the browser if the user clicks any doubtful pop-up ads related to it. Our researchers say the user may notice such ads on unreliable file-sharing web pages and other suspicious sites or the ads might be displayed on top of the browser or web pages you visit by adware, browser hijackers, potentially unwanted programs, and so on. Therefore, it might be a good idea to perform a full system scan with a trustworthy antimalware tool and remove any possible threats. In order to maintain the computer clean, it would be advisable always to update your chosen antimalware tool whenever it is possible. Additionally, we would recommend staying away from unreliable web pages and paying more attention to the software you wish to install.

How does Mozilla Firefox Critical Error work?

At first, the user should be redirected to where he is supposed to see a text claiming something went wrong with the system. It might even claim someone attempted to gain control of your system and steal your sensitive data, e.g., banking information, email or social media accounts’ passwords, etc. Only a few moments later the user might see a specific pop-up saying the mentioned website is “requesting your username and password.” Plus, the rest of the message may say: “FIREFOX_CRITICAL_ERROR_0xKB1546764_CALL_HELP_DESK: +1 (877) 556-6888 (Toll-Free).” Our researchers tell it might be best not to interact with the described pop-up and it would be smart to remove it at once. For instance, you could close the tab with the Mozilla Firefox Critical Error’s web page or the whole browser.

No doubt, what we do not advise doing is contacting the so-called “help desk,” because instead of talking to qualified support members, you could end up listening to scammers. For example, they might tell you to buy a specific tool or offer to fix the device remotely. In other words, the user could end up wasting money on the software or services he does not need, and what is even worse, while doing so the user might reveal his login information, banking account details, etc.

How to delete Mozilla Firefox Critical Error?

A simple browser reset should help you eliminate Mozilla Firefox Critical Error, but if it keeps reappearing, you may want to scan your system with a legitimate antimalware tool and erase threats that could be responsible for redirecting you to the scams website. The instructions placed at the end of this paragraph will show less experienced users how to reset Mozilla Firefox and how to close it with the Task Manager if the user cannot do so by pressing the browser’s X button.

Erase Mozilla Firefox Critical Error

  1. Tap Ctrl+Alt+Delete.
  2. Choose Task Manager and go to the Processes tab.
  3. Locate and select the Mozilla Firefox process.
  4. Click the End Task button to kill this process.
  5. Exit Task Manager.
  6. Relaunch the browser.
  7. Tap the Help icon (top-left corner).
  8. Click on Troubleshooting information.
  9. Press Refresh Firefox and then click Refresh Firefox again.
  10. Select Finish. 100% FREE spyware scan and
    tested removal of Mozilla Firefox Critical Error*

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