Firefox does not boot. Firefox: Safe Mode. Why mazila slowly loads and how to speed it up

This article Describes What to do if Firefox Doesn "T Open When You Click The Firefox Icon.

  • If You Get A Message You Can Dismiss (E.G. "TypeRerror: Components.classes [" @ ...; 1 "] is undefined", "OnLoad Error Typeerror: ...", "Exc in Ev Handl: ...") And Can Open Firefox, See.
  • If Firefox Starts But Won "T Load Any WebSites, See WebSites Don" T Load - Troubleshoot and Fix Error Messages.

Firefox IS Already Running But Is Not Responding

Your Firefox Profile Cannot Be Loaded. IT May Be Missing or Inaccessible

Failed to Read The Configuration File

This error is Caused by A Problem with Firefox program Files.. The Solutions Is To Remove The Firefox Program and then Reinstall Firefox. (This Will Not Remove Your Passwords, Bookmarks Or Other User Data and Settings Which Are Stored in a Separate Folder.)

  1. Delete The Firefox Installation Directory, Found In One Of These Locations by Default:
    • C: \\ Program Files \\ Mozilla Firefox.
    • C: \\ Program Files (x86) \\ Mozilla Firefox
  2. Use Another Browser to download the Firefox Installer from the Firefox Download Page and Install It. See How To Download and Install Firefox On Windows for Details.

Xulrunner - Error

If you See the Message, "Xulrunner - Error: Platform Version IS NOT COMPATIBLE WITH MINVERSION "" (""Depends On Version Number), After A Software Update, Use Another Browser to download the Firefox Installer from the Firefox Download Page, Save It To the Desktop or Other Location, Delete The Firefox Installation Directory and then reinstall Firefox..

There Was An Error Launching The Application

This Error Indicates That Either Firefox Is Not Installed or Your Shortcut to IT IS Incorrect. Make Sure That Firefox Is Installed At The Location Specified by The Shortcut. If IT ISN "T, Install Firefox If Necessary, Then Modify The Shortcut to Point to the Correct Location.

Error Opening File for Writing ...

If You Receive the Above Error When Launching Firefox On A Windows System, You may be Required by Firefox to Log in AS An Administrator. You can Either Reboot The Computer Or, If You Have An Administrator Account, You Can Execute The Program AS An Administrator.

  1. Find The Firefox.exe Program File In The Firefox Application Folder on Your System.
  2. Right-Click The icon.
  3. SELECT RUN AS ...SELECT RUN AS Administrator .... SELECT THE FOLLOWING USER:. From The User Name Drop-Down, Select Administrator. Or Another User That Has Administrator Privileges. ENTER THE PASSWORD REQUIRED TO LOG IN TO THIS ACCOUNT. Click OK.
  4. The Firefox Application Is Started using the Administrator Windows Account. The user That Was Used to Log in to Windows At Startup is Still The Active One.

Other Error Messages.

If You Get Another Error Message (E.G. "XML Parsing Error: undefined Entity Location", "Secure Connection Failed ... Uses An Invalid Security Certificate"), See Troubleshoot Extensions, Themes and Hardware Acceleration Issues to Solve Common Firefox Problems.

No Error Message

If You Click The Firefox Icon But No Firefox Window Opens and No Error Message Is Shown, a Simple Step Is To Restart Your Computer and then Try Again. If Firefox Still Does Not Start, See The Following Sections.

Firefox Will Not Start After Updating

  • If You Use Certain Versions of Zonealarm Or Other Internet Security Software Tat Includes a "Virtual Browsing" Feature, It Can Prevent Firefox from Starting. Check Virtual Cache, IF Your Internet Security Software Includes This Feature, Or Visit The Software Provider "S Support Site for More Help.
  • Firefox May Fail to Start For Some Windows Users After Updating, If Avg OR Avast Antivirus. IS Installed. For details, See this Techdows Article.

Firefox Will Not Start After Installing Add-Ons

IF Firefox Previous Worked But Stopped After You Installed Extensions Or Themes, See

Do you have days that Firefox just does not want to work? For such cases, we created this guide. Here you will learn where to find a solution to many major problems, and if you need separate assistance - as always, our volunteers are ready to help you.

Firefox is slowly working

Such slowdowns can be caused by several reasons, so we decided to describe them in a separate manual called Firefox running slowly - how to speed it up.

Web pages are not loaded

You have error messages when you try to download some site? Browse the following articles to help you with some connection problems.

  • If you just updated Firefox, and it no longer opens a single website, and other browsers or programs do it, read the article cannot be connected with websites after updating Firefox.
  • If any program fails to open websites, read the Firefox article and other browsers cannot download websites.
  • If Firefox fails to load only some individual websites, read the Firefox article cannot download sites, although other browsers can.
  • If you have a different problem with downloading websites, read the article Websites are not loaded - solving the problem and correct error.

Articles above did not help. What to do?

It is sometimes difficult to find the cause of such problems. For such cases, we have a team of volunteers, ready to help you figure it out.

Not a single Internet user is insured against problems in the browser. As a rule, they arise at the most inopportune moment, and make everyone, especially inexperienced user, is great to recover. Nevertheless, when such an unpleasant surprise arises with the web browser, it is possible to get rid of small blood, even if there is not enough experience or knowledge.

As an example, I will bring Mozilla browser, and not at all in vain, because it is deservedly popular among Internet users from around the world. So, if a problem arises with the Mozilla, the most reasonable thing that can be done is to activate safe mode Firefox. What it is, how to enable it and disable, learn later.

That such a safe mode

The term "Safe Mode" means the special mode of operation existing in the browser, which can be used to solve the problems of the web browser. It helps to recover some parameters, change the settings, disable extensions (, visual bookmarks etc.), which are the potential cause of problems. In such a browser mode, the user is easier to find the source of the problem and eliminate it.

How to enable secure mode

To enable secure mode in Firefox, you need to perform a few uncomplicated actions, namely:

  • the very first step is to close the browser, in our case - Mozilla Firefox;
  • there are several options for running a secure mode. Standard means that you need to go to the start menu and click the line "Run". By the way, for fans of the use of hot keys: if you simultaneously hold the combination "Win + R", the result will be the same;
  • next, a new window will appear, in which you need to write the same in the input row that it is in the screenshot below and click. Ready!

After you launched a safe mode, a window should appear with the settings that you see in the screenshot.

In short, we will pass in some: the line "Disable all add-ons" means that Mozilla will operate in the usual mode, but its extensions will be disabled. Do not be afraid, you will not be able to accidentally in this way.

The "Replace your bookmarks ..." parameter means that all open bookmarks will be removed, and replaced by a browser to other, more preferred for it. As for the "Restore Set ..." parameter, in the event that it is noted that all search plugins by default will be restored to the same moment.

How to get out of a secure mode

Disable secure mode in Firefox is very simple: you need to close the Firefox copy running in safe mode and click on the browser shortcut to run it as you usually do it.

Safe mode is undoubtedly important, because from malfunctions with a browser is not insured by any computer. However, now you can not worry if such a problem has happened to you, because there is a solution, and it is absolutely simple!

Video to help

A rather frequent situation: you double-click the Mozilla Firefox shortcut on the desktop or opened this application from the taskbar, but collided with the fact that the browser refuses to start.

Unfortunately, the problem is when browser Mozilla. Firefox refuses to start, rather often, and a variety of reasons may affect its appearance. Today we will look at the main reasons, as well as ways to troubleshoot problems with the launch of Mozilla Firefox.

Option 1: "Firefox is launched and does not respond"

One of the most frequent sensitors of Firefox disability when you are trying to start the browser, but instead you receive a message "Firefox is launched and does not respond" .

As a rule, a similar problem appears after the previous incorrect closing of the browser, when it continues to perform his processes, thus, without giving start a new session.

First of all, we need to complete all Firefox processes. To do this, press the key combination Ctrl + SHIFT + ESC , to open "Task Manager" .

In the window that opens you will need to go to the tab "Processes" . Find the Firefox process ("Firefox.exe"), click on it right-click mouse and in the displayed context menu Select "Remove the task" .

If you find other processes associated with Firefox, they will also need to be completed.

After performing these actions, try running a browser.

If Mozilla Firefox never started, still giving out the error "Firefox is running and not responding", then in some cases it may say that you have no need for access rights.

To check it out, you will need to get into the profile folder. Make it, of course, easier with the help of Firefox itself, but considering that the browser does not start, we will use another way.

Press the keyboard simultaneous keyboard shortcut. Win + R.. The "Run" window will be displayed on the screen, in which you will need to enter the command below and press the Enter key:

% APPDATA% \\ Mozilla \\ Firefox \\ PROFILES \\

The screen displays the profile folder. As a rule, if you did not create additional profiles, you will see only one folder in the window. If you use multiple profiles, then for each profile will require further actions individually.

Right-click on the Firefox profile and go to the item in the displayed context menu. "Properties" .

The window shows the window in which you need to go to the tab "General" . In the bottom area of \u200b\u200bthe window, make sure that you have an item "Only for reading" . If there is no checkmark (point) about this item, it must be set independently, and then save the settings.

Option 2: "File reading error"

If on the screen after trying to run Firefox a message is displayed "Customizing configuration file error" then this means that there are problems with filefox filesAnd the easiest way to solve the problem is to reinstall Mozilla Firefox.

First of all, you will need to completely remove the Firefox from the computer. About how this task You can implement, we have already told in one of our articles.

Open windows Explorer And delete the following folders:

C: \\ Program Files \\ Mozilla Firefox

C: \\ Program Files (x86) \\ Mozilla Firefox

And only after you complete the removal of Firefox, you can start downloading a new version from the developer's official website.

Option 3: "File opening error for recording"

A similar plan error is displayed, as a rule, in cases where you use an account without administrator rights on your computer.

Accordingly, in order to solve the problem, you need administrator rights to get, but this can be done specifically for the application running.

Just click the Firefox shortcut on the desktop right-click and in the displayed context menu, click on item. "Run on the name of the administrator" .

A window will appear on the screen in which you need to select an account that has administrator rights, and then enter a password from it.

Option 4: "Your Firefox profile cannot be loaded. It may be damaged or unavailable. "

A similar error obviously hints to us that there are problems with the profile, for example, it is not available or is completely absent on the computer.

As a rule, a similar problem occurs if you were renamed, moved or removed the folder with the Firefox profile.

Based on this, you have several ways to solve the problem:

1. Move the profile to your previous place if you moved it before;

2. If you renamed the profile, then it needs to ask the previous name;

3. If you can not use the first two ways, then you will need to create a new profile. It should be borne in mind that by creating a new profile, you will get pure Firefox.

In order to proceed to creating a new profile, open the "Run" window with a key combination Win + R. . In this window you will need to spend the following command:

firefox.exe -p.

The Control window will appear on the screen. firefox profiles. We will need to resort to creating a new profile, so we click on the button "Create" .

Enter a name for the profile, as well as, if necessary, in the same window, specify the location on the computer, where the folder with the profile will be stored. Complete profile.

The Firefox Profile Controls window will again appear on the screen, in which you will need to highlight a new profile, and then click on the button "Run Firefox" .

Option 5: Error reporting Firefox fall

A similar problem manifests itself when you run the browser. You can even have a window, but the application is closed sharply, and the Firefox fall on the screen appears on the screen.

In this case, Firefox falls can cause various factors: viruses, installed add-ons, themes, etc.

First of all, in this case you will need to scan using your antivirus or a special attending utility, for example, Dr.Web Cureit..

After scanning, be sure to restart the computer, and then check the working capacity of the browser.

If the problem remains, it is worth trying to fully reinstall the browser, after completely removing the web browser from the computer.

After the removal is completed, you can start installing a fresh browser version from the developer's official website.

Option 6: "Xulrunner Error"

If when you try to start Firefox on your screen, an error "Xulrunner" error is displayed, it may say that on your computer installed an irrelevant version of Firefox.

You will need to completely remove the Firefox from the computer, which before we had already been told on our website.

After completing the complete removal of the browser from the computer, download new version Web browser from the official site of the developer.

Option 7: Does not open with mozil, but it does not give mistakes

1) If before the browser work is fine, but at some point it stopped run, most an effective way Eliminate the problem is to restore the system.

This procedure will allow you to restore the system by the time when the browser work was performed correctly. The only thing this procedure will leave are user files (documents, music, photos and video).

In order to start the system rollback process, open the menu "Control Panel" Install the viewing mode in the upper right corner "Small signs" and then open the section "Restoration" .

In the window that opens, select item "Running system recovery" And wait a few moments.

Choose a suitable kickback point when Firefox worked fine. Please note that depending on the changes made from that time, the system recovery can take both a few minutes and a few hours.

2) Some antivirus products can affect problems with the work of Firefox. Try to pause their work and check the performance of Firefox.

If, according to the results of the verification, it was the antivirus or a different protective program, it will be necessary to disable the network scan function or another function associated with the browser or network access.

3) Try running Firefox in safe mode. To do this, clamp the SHIFT key and click the browser shortcut.

If the browser started normally, this indicates a conflict between the browser and the established extensions, themes, etc.

To begin with, turn off all the browser additions. To do this, click in the upper right corner along the menu button, and then in the displayed window, go to the section. "Additions" .

In the left area, go to the tab "Extensions" And then turn off all extensions. It will be worth it if you remove them at all from the browser.

If you have third-party themes for Firefox, try back to the standard topic. To do this, go to the tab « Appearance» And make a topic "Standard" Theme by default.

And finally, try to disable hardware acceleration. To do this, open the browser menu and go to the section. "Settings" .

In the left area of \u200b\u200bthe window, go to the tab "Additional" and then open the sample "General" . Here you will need to remove the checkbox from the point. "If possible, use hardware acceleration" .

After performing all actions, open the browser menu and in the bottom area window, click on the icon. "Output" . Try running the browser in normal mode.

4) Reinstall the browser and create a new profile. About how this task is to implement has already been described above.

And a small conclusion. Today we reviewed the basic ways to eliminate problems with the launch of the Mozilla Firefox browser. If you have your own method of eliminating the problem, share it in the comments.

After long-term operation or immediately after loading from the network, mozilla program Firefox refuses to turn on in a normal working pace, does not start at all. The reasons for such a reaction can be much and to productively eliminate the malfunctions, it is closer to consider their true character.

Browser does not function

The fast and multifunctional Mozilla system element is installed on many mobile and computer devices. Reviews about his work are almost always a positive character, but often network users complain about problems with the launch.

Almost always does not open the system after a long service or refuses to boot Yandex and each problematic situation of this type has its own explanation. The most common faults due to which there is such a problematic situation, it is worth reconsider now.

Causes of the lack of reaction of the program

To the question of why the Mozil program does not work, people cannot give an unequivocal response, because they are not all familiar with modern technological features, processes. There are several possible options for the development of situations in which Yandex or Mozilla Firefox cannot start using the instrument used. The most common characteristics of this level should be called:

  • lack of timely expansion update;
  • the presence within the applied gadget viruses;
  • accidentally produced process forced closure of the content component;
  • system failures, as in terms of work softwareand inside the technical device;
  • the installed version of Firefox has no compatibility with a specific PC or mobile type gadget.


The system refuses to open at all or, during individual cases, it starts, and then immediately closes when the Yandex or another site is input. Proceeds often occur and malfunctions after re-launching a multimedia device, long-term operation on the network, opening multiple browsers together, programs that impede the normal functional activities of other extensions.

Possible ways to solve the problem

If the opening system element hangs so much that it is not possible to cooperate with it completely impossible, it is not necessary to try to bring it into a sense, but it is better to look for productive techniques to resolve such a serious problem.

To open and use the specified systemic support as quickly as possible, while qualitatively, it is worth trying to perform the following resuscitation:


One of these tips should help open the system, go to the Yandex search engine and use Mozilla effectively.


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