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Firefox won't start - find solutions

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This articles describes what to do if the Firefox window doesn't open when you click the Firefox icon. * If Firefox starts but won't load any websites, see [[Error loading web sites]]. * If you get error messages that indicate a crash, such as "''Firefox has encountered a problem and needs to close''", "''Quality Feedback Agent''", or "''Mozilla Crash Reporter''", see [[Firefox crashes]]. __TOC__ {for win} = Extension prevented Firefox from closing properly = <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=548945 --> '''Norton IPS''', '''Norton Toolbar''', and '''Skype 4.0''' are all known to prevent Firefox from closing properly. Firefox is still running, but no windows are open. # Right-click on an empty spot in the Windows task bar and select {menu Task Manager} (or press {key Ctrl}+{key Shift}+{key Esc}). {note}'''Note''': On newer versions of Windows (XP, Vista, 7) the combination {key Ctrl}+{key Alt}+{key Del} opens Task Manager as well.{/note} <br/> <br/> [[Image:notron360sucks-taksmanager.png]] <br/> <br/> # When the Windows Task Manager opens, select the {menu Processes} tab. <br/> <br/> [[Image:TaskManagerProcesses.png]]<br/> <br/> # Select the entry for '''firefox.exe''' (press {key F} on the keyboard to find it) and click {button End Process}. # Click {button Yes} in the "Task Manager Warning" dialog that appears. <br/> <br/>[[Image:TaskMgrWarning.PNG]]<br/> <br/> # Repeat the above steps to end any additional firefox.exe processes, if more than one entry is found, then exit the Windows Task Manager. # Start Firefox normally. # At the top of the Firefox window, click on the {menu Tools} menu, and select {menu Add-ons}. # Select the {menu Extensions} panel. # (If it is listed) Select '''Norton IPS''' and click {button Disable}. # (If it is listed) Select '''Norton Toolbar''' and click {button Disable}. # (If it is listed) Select '''Skype 4.0''' and click {button Disable}. # Click on {button Restart Firefox}. {/for} = Specific error messages = == Firefox is already running but is not responding == See [[Firefox is already running but is not responding]] for solutions. {for linux} == 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, [[Installing Firefox on Linux|install Firefox]] if necessary, then modify the shortcut to point to the correct location. {/for} {for win} == The program must close to allow a previous installation attempt to complete. Please restart. == If you get a message saying -+The program must close to allow a previous installation attempt to complete. Please restart.+- when you start Firefox, see [[The program must close to allow a previous installation attempt to complete]]. {/for} {for win} == 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. # Find the {filepath firefox.exe} program file in the Firefox application folder on your system. # Right-click the icon. ** '''(Windows XP)''' Select {menu Run As...}. 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 {button OK}. ** '''(Windows 7 and Vista)''' Select {menu Run As Administrator...}. Complete a similar set of steps, as those listed above. # 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. {/for} {for mac} = Firefox 3 will not start on OSX 10.3.9 or earlier = {/for} {for win} = Firefox 3 will not start on Windows 98/ME or earlier = {/for} {for win,mac} Mozilla has stopped supporting {for mac}OSX 10.3.9{/for}{for win}Windows 98/ME{/for} and earlier in Firefox 3.0 and higher. None of these operating systems are supported by {for mac}Apple{/for}{for win}Microsoft{/for} (and have not been for quite some time) and have multiple vulnerabilities that will remain unpatched. As such, you have the following options: # You can switch to another operating system. This is the most secure option. If you don't want to pay for a new operating system, you can get any of a number of versions of [http://www.linux.org/dist/list.html Linux] which can run Firefox 3+ and can run on older machines. This ensures you have a completely secure system and access to all the great new features in Firefox 3+. #You can continue to use Firefox 2 which you can get from: {for mac}[ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/mac/en-US/Firefox%202.0.0.20.dmg our FTP site]{/for}{for win}[ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/win32/en-US/Firefox%20Setup%202.0.0.20.exe our FTP site]{/for}. Just because the browser will no longer receive security updates doesn't mean it will simply stop working. You will be using unsupported software on an unsupported operating system which poses a significant security risk. {/for} = Firefox will not start after installing add-ons = If Firefox previously worked but stopped after you installed extensions or themes, see [[Troubleshooting extensions and themes]]. = Firefox previously worked = If Firefox previously worked but suddenly doesn't start, it may be due to some corrupt data in your settings. Uninstalling and reinstalling Firefox would not fix this problem because your settings are not removed on uninstall. To test to see if this is the problem, use the [[Managing profiles|Profile Manager]] to create a new profile. If the problem goes away, you can then [[Recovering important data from an old profile|move your bookmarks and other important settings into the new profile]]. {for linux} = Firefox will not start on Linux = If you installed Firefox outside of your package manager, make sure that your system has the libraries listed in the [http://www.mozilla.com/en-US/firefox/system-requirements system requirements]. {/for} <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Browser_will_not_start_up Browser will not start up (mozillaZine KB)]'''''
This article describes what to do if the Firefox window doesn't open when you click the Firefox icon. {note}'''Note:''' As a first step, you should simply restart the computer. If Firefox still does not start or if the problem returns, this article can help you fix the problem.{/note} * If Firefox starts but won't load any websites, see [[Error loading web sites]]. * If you get error messages that indicate a crash, such as "''Firefox has encountered a problem and needs to close''", "''Quality Feedback Agent''", or "''Mozilla Crash Reporter''", see [[Firefox crashes]]. __TOC__ {for win} = Extension prevented Firefox from closing properly = <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=548945 --> '''Norton IPS''', '''Norton Toolbar''', and '''Skype 4.0''' are all known to prevent Firefox from closing properly. Firefox is still running, but no windows are open. # Right-click on an empty spot in the Windows task bar and select {menu Task Manager} (or press {key Ctrl}+{key Shift}+{key Esc}). {note}'''Note''': On newer versions of Windows (XP, Vista, 7) the combination {key Ctrl}+{key Alt}+{key Del} opens Task Manager as well.{/note} <br/> <br/> [[Image:notron360sucks-taksmanager.png]] <br/> <br/> # When the Windows Task Manager opens, select the {menu Processes} tab. <br/> <br/> [[Image:TaskManagerProcesses.png]]<br/> <br/> # Select the entry for '''firefox.exe''' (press {key F} on the keyboard to find it) and click {button End Process}. # Click {button Yes} in the "Task Manager Warning" dialog that appears. <br/> <br/>[[Image:TaskMgrWarning.PNG]]<br/> <br/> # Repeat the above steps to end any additional firefox.exe processes, if more than one entry is found, then exit the Windows Task Manager. # Start Firefox normally. # At the top of the Firefox window, click on the {menu Tools} menu, and select {menu Add-ons}. # Select the {menu Extensions} panel. # (If it is listed) Select '''Norton IPS''' and click {button Disable}. # (If it is listed) Select '''Norton Toolbar''' and click {button Disable}. # (If it is listed) Select '''Skype 4.0''' and click {button Disable}. # Click on {button Restart Firefox}. {/for} = Specific error messages = == Firefox is already running but is not responding == See [[Firefox is already running but is not responding]] for solutions. {for linux} == 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, [[Installing Firefox on Linux|install Firefox]] if necessary, then modify the shortcut to point to the correct location. {/for} {for win} == The program must close to allow a previous installation attempt to complete. Please restart. == If you get a message saying -+The program must close to allow a previous installation attempt to complete. Please restart.+- when you start Firefox, see [[The program must close to allow a previous installation attempt to complete]]. {/for} {for win} == 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. # Find the {filepath firefox.exe} program file in the Firefox application folder on your system. # Right-click the icon. ** '''(Windows XP)''' Select {menu Run As...}. 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 {button OK}. ** '''(Windows 7 and Vista)''' Select {menu Run As Administrator...}. Complete a similar set of steps, as those listed above. # 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. {/for} {for mac} = Firefox 3 will not start on OSX 10.3.9 or earlier = {/for} {for win} = Firefox 3 will not start on Windows 98/ME or earlier = {/for} {for win,mac} Mozilla has stopped supporting {for mac}OSX 10.3.9{/for}{for win}Windows 98/ME{/for} and earlier in Firefox 3.0 and higher. None of these operating systems are supported by {for mac}Apple{/for}{for win}Microsoft{/for} (and have not been for quite some time) and have multiple vulnerabilities that will remain unpatched. As such, you have the following options: # You can switch to another operating system. This is the most secure option. If you don't want to pay for a new operating system, you can get any of a number of versions of [http://www.linux.org/dist/list.html Linux] which can run Firefox 3+ and can run on older machines. This ensures you have a completely secure system and access to all the great new features in Firefox 3+. #You can continue to use Firefox 2 which you can get from: {for mac}[ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/mac/en-US/Firefox%202.0.0.20.dmg our FTP site]{/for}{for win}[ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/win32/en-US/Firefox%20Setup%202.0.0.20.exe our FTP site]{/for}. Just because the browser will no longer receive security updates doesn't mean it will simply stop working. You will be using unsupported software on an unsupported operating system which poses a significant security risk. {/for} = Firefox will not start after installing add-ons = If Firefox previously worked but stopped after you installed extensions or themes, see [[Troubleshooting extensions and themes]]. = Firefox previously worked = If Firefox previously worked but suddenly doesn't start, it may be due to some corrupt data in your settings. Uninstalling and reinstalling Firefox would not fix this problem because your settings are not removed on uninstall. To test to see if this is the problem, use the [[Managing profiles|Profile Manager]] to create a new profile. If the problem goes away, you can then [[Recovering important data from an old profile|move your bookmarks and other important settings into the new profile]]. {for linux} = Firefox will not start on Linux = If you installed Firefox outside of your package manager, make sure that your system has the libraries listed in the [http://www.mozilla.com/en-US/firefox/system-requirements system requirements]. {/for} <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Browser_will_not_start_up Browser will not start up (mozillaZine KB)]'''''

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