Everytime I open Firefox I get a message: "an attempt to change your home page has been blocked" and firefox crashes

Everytime I open Firefox I get a message: "an attempt to change your home page has been blocked" and firefox crashes.
I unintalled (on my MAC) and reinstalled twice. Makes no difference. Any suggestions?

Could you try starting Firefox in Safe Mode? It is a standard diagnostic tool to disable some advanced features of Firefox and extensions. More info: questions to troubleshoot Firefox in Safe Mode.

Does not work if Firefox: Hold down the option key when starting Firefox.

If Firefox is running: You can restart Firefox in Mode safe mode using either:

button "3-bar" menu > "?" button > restart with disabled modules
Help menu > restart with disabled modules

and OK reboot.

Two scenarios: A small dialog box should appear. Click on 'Start mode safe' (not update).

Any improvement?

While you are in Mode without failure, you could copy a list of your extensions and paste them into an answer? The best place for this is the support information page - either:

button "3-bar" menu > "?" button > troubleshooting information
(menu bar) Help > troubleshooting information
type or paste everything: in the address bar and press Enter

Scroll down to the Extensions section, and then select from there until the end of the following table with the mouse and copy. Then paste into a response. It may seem a bit messy but don't worry, we're used to it.

In addition, if you check your homepage settings, he changed? This article explains where to find that page preferences: start-up, homepage, tabs and download settings.

Tags: Firefox

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http://windowslivehelp.com/forums.aspx?ProductID=1

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Folder Found : C:\Documents and Settings\Steve\Application Data\Mozilla\Firefox\Profiles\xsyhhf7s.default\extensions\staged
Software\Microsoft\Windows\CurrentVersion\Ext\Stats\{02478D38-C3F9-4EFB-9B51-7695ECA05670}
Microsoft\Windows\CurrentVersion\Ext\Stats\{07B18EA1-A523-4961-B6BB-170DE4475CCA}
Microsoft\Windows\CurrentVersion\Ext\Stats\{07B18EA9-A523-4961-B6BB-170DE4475CCA}
Classes\CLSID\{147A976F-EEE1-4377-8EA7-4716E4CDD239}
Classes\CLSID\{1E0DE227-5CE4-4EA3-AB0C-8B03E1AA76BC}
Classes\CLSID\{9AFB8248-617F-460D-9366-D71CDEDA3179}
\CLSID\{A4730EBE-43A6-443E-9776-36915D323AD3}
\FunWebProducts.DataControl
FunWebProducts.DataControl.1
FunWebProducts.HistoryKillerScheduler
FunWebProducts.HistoryKillerScheduler.1
FunWebProducts.HistorySwatterControlBar
FunWebProducts.HistorySwatterControlBar.1
FunWebProducts.HTMLMenu
FunWebProducts.HTMLMenu.1
FunWebProducts.HTMLMenu.2
FunWebProducts.IECookiesManager
FunWebProducts.IECookiesManager.1
FunWebProducts.KillerObjManager
FunWebProducts.KillerObjManager.1
FunWebProducts.PopSwatterBarButton
FunWebProducts.PopSwatterBarButton.1
FunWebProducts.PopSwatterSettingsControl
 FunWebProducts.PopSwatterSettingsControl.1
Interface\{07B18EAA-A523-4961-B6BB-170DE4475CCA}
Interface\{07B18EAC-A523-4961-B6BB-170DE4475CCA
Interface\{1093995A-BA37-41D2-836E-091067C4AD17}
Interface\{120927BF-1700-43BC-810F-FAB92549B390}
Interface\{17DE5E5E-BFE3-4E83-8E1F-8755795359EC}
Interface\{1F52A5FA-A705-4415-B975-88503B291728}
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SOFTWARE\Classes\Interface\{3E1656ED-F60E-4597-B6AA-B6A58E171495}
 HKLM\SOFTWARE\Classes\Interface\{3E53E2CB-86DB-4A4A-8BD9-FFEB7A64DF82}
 HKLM\SOFTWARE\Classes\Interface\{3E720451-B472-4954-B7AA-33069EB53906}
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 HKLM\SOFTWARE\Classes\Interface\{63D0ED2B-B45B-4458-8B3B-60C69BBBD83C}
HKLM\SOFTWARE\Classes\Interface\{63D0ED2D-B45B-4458-8B3B-60C69BBBD83C}
HKLM\SOFTWARE\Classes\Interface\{6E74766C-4D93-4CC0-96D1-47B8E07FF9CA}
HKLM\SOFTWARE\Classes\Interface\{72EE7F04-15BD-4845-A005-D6711144D86A}
HKLM\SOFTWARE\Classes\Interface\{741DE825-A6F0-4497-9AA6-8023CF9B0FFF}
HKLM\SOFTWARE\Classes\Interface\{7473D291-B7BB-4F24-AE82-7E2CE94BB6A9}
HKLM\SOFTWARE\Classes\Interface\{7473D293-B7BB-4F24-AE82-7E2CE94BB6A9}
HKLM\SOFTWARE\Classes\Interface\{7473D295-B7BB-4F24-AE82-7E2CE94BB6A9}
HKLM\SOFTWARE\Classes\Interface\{7473D297-B7BB-4F24-AE82-7E2CE94BB6A9}
HKLM\SOFTWARE\Classes\Interface\{8E9CF769-3D3B-40EB-9E2D-76E7A205E4D2}
HKLM\SOFTWARE\Classes\Interface\{90449521-D834-4703-BB4E-D3AA44042FF8}
HKLM\SOFTWARE\Classes\Interface\{991AAC62-B100-47CE-8B75-253965244F69}
HKLM\SOFTWARE\Classes\Interface\{A626CDBD-3D13-4F78-B819-440A28D7E8FC}
HKLM\SOFTWARE\Classes\Interface\{BBABDC90-F3D5-4801-863A-EE6AE529862D}
HKLM\SOFTWARE\Classes\Interface\{CF54BE1C-9359-4395-8533-1657CF209CFE}
HKLM\SOFTWARE\Classes\Interface\{D6FF3684-AD3B-48EB-BBB4-B9E6C5A355C1}
HKLM\SOFTWARE\Classes\Interface\{DE38C398-B328-4F4C-A3AD-1B5E4ED93477}
HKLM\SOFTWARE\Classes\Interface\{E342AF55-B78A-4CD0-A2BB-DA7F52D9D25E}
HKLM\SOFTWARE\Classes\Interface\{E342AF55-B78A-4CD0-A2BB-DA7F52D9D25F}
HKLM\SOFTWARE\Classes\Interface\{E79DFBC9-5697-4FBD-94E5-5B2A9C7C1612}
HKLM\SOFTWARE\Classes\Interface\{E79DFBCB-5697-4FBD-94E5-5B2A9C7C1612}
HKLM\SOFTWARE\Classes\Interface\{EB9E5C1C-B1F9-4C2B-BE8A-27D6446FDAF8}
HKLM\SOFTWARE\Classes\Interface\{F87D7FB5-9DC5-4C8C-B998-D8DFE02E2978}
HKLM\SOFTWARE\Classes\MyWebSearch.ChatSessionPlugin
HKLM\SOFTWARE\Classes\MyWebSearch.ChatSessionPlugin.1
HKLM\SOFTWARE\Classes\MyWebSearch
HKLM\SOFTWARE\Classes\MyWebSearch.HTMLPanel.1
HKLM\SOFTWARE\Classes\MyWebSearch.MultipleButton
HKLM\SOFTWARE\Classes\MyWebSearch.MultipleButton.1
HKLM\SOFTWARE\Classes\MyWebSearch.OutlookAddin
HKLM\SOFTWARE\Classes\MyWebSearch.OutlookAddin.1
HKLM\SOFTWARE\Classes\MyWebSearch.PseudoTransparentPlugin
HKLM\SOFTWARE\Classes\MyWebSearch.PseudoTransparentPlugin.1
HKLM\SOFTWARE\Classes\MyWebSearch.ThirdPartyInstaller
HKLM\SOFTWARE\Classes\MyWebSearch.ThirdPartyInstaller.1
HKLM\SOFTWARE\Classes\MyWebSearch.UrlAlertButton
HKLM\SOFTWARE\Classes\MyWebSearch.UrlAlertButton.1
HKLM\SOFTWARE\Classes\MyWebSearchToolBar.SettingsPlugin
HKLM\SOFTWARE\Classes\MyWebSearchToolBar.SettingsPlugin.1
HKLM\SOFTWARE\Classes\MyWebSearchToolBar.ToolbarPlugin
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HKLM\SOFTWARE\Classes\ScreenSaverControl.ScreenSaverInstaller
HKLM\SOFTWARE\Classes\ScreenSaverControl.ScreenSaverInstaller.1
HKLM\SOFTWARE\Classes\TypeLib\{07B18EA0-A523-4961-B6BB-170DE4475CCA}
HKLM\SOFTWARE\Classes\TypeLib\{0D26BC71-A633-4E71-AD31-EADC3A1B6A3A}
HKLM\SOFTWARE\Classes\TypeLib\{29D67D3C-509A-4544-903F-C8C1B8236554}
HKLM\SOFTWARE\Classes\TypeLib\{3E720450-B472-4954-B7AA-33069EB53906}
HKLM\SOFTWARE\Classes\TypeLib\{7473D290-B7BB-4F24-AE82-7E2CE94BB6A9}
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HKLM\SOFTWARE\Classes\TypeLib\{D518921A-4A03-425E-9873-B9A71756821E}
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HKLM\SOFTWARE\Classes\TypeLib\{E79DFBC0-5697-4FBD-94E5-5B2A9C7C1612}
HKLM\SOFTWARE\Classes\TypeLib\{F42228FB-E84E-479E-B922-FBBD096E792C}
HKLM\Software\FocusInteractive
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HKLM\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{68AF847F-6E91-45DD-9B68-D6A12C30E5D7}
HKLM\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{9170B96C-28D4-4626-8358-27E6CAEEF907}
HKLM\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{D1A71FA0-FF48-48DD-9B6D-7A13A3E42127}
HKLM\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{DDB1968E-EAD6-40FD-8DAE-FF14757F60C7}
HKLM\SOFTWARE\Microsoft\Internet Explorer\Low Rights\ElevationPolicy\{F138D901-86F0-4383-99B6-9CDD406036DA}
HKLM\SOFTWARE\Microsoft\Internet Explorer\Low Rights\RunDll32Policy\f3ScrCtr.dll
HKLM\SOFTWARE\Microsoft\Internet Explorer\SearchScopes\{56256A51-B582-467E-B8D4-7786EDA79AE0}
HKLM\SOFTWARE\Microsoft\Multimedia\WMPlayer\Schemes\f3pss
HKLM\SOFTWARE\Microsoft\Office\Outlook\Addins\MyWebSearch.OutlookAddin
HKLM\SOFTWARE\Microsoft\Office\Word\Addins\MyWebSearch.OutlookAddin
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\App Management\ARPCache\mywebsearch bar uninstall
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{02478D38-C3F9-4EFB-9B51-7695ECA05670}
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{07B18EAB-A523-4961-B6BB-170DE4475CCA}
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{08858AF6-42AD-4914-95D2-AC3AB0DC8E28}
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{1D4DB7D2-6EC9-47A3-BD87-1E41684E07BB}
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{25560540-9571-4D7B-9389-0F166788785A}
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{3DC201FB-E9C9-499C-A11F-23C360D7C3F8}
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{3E720452-B472-4954-B7AA-33069EB53906}
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{63D0ED2C-B45B-4458-8B3B-60C69BBBD83C}
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{7473D294-B7BB-4F24-AE82-7E2CE94BB6A9}
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{98D9753D-D73B-42D5-8C85-4469CDA897AB}
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{9FF05104-B030-46FC-94B8-81276E4E27DF}
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Ext\PreApproved\{E79DFBCA-5697-4FBD-94E5-5B2A9C7C1612}
HKLM\Software\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Components\063A857434EDED11A893800002C0A966
HKLM\SOFTWARE\MozillaPlugins\@mywebsearch.com/Plugin
HKLM\Software\MyWebSearch
HKCU\Software\Microsoft\Internet Explorer\Toolbar\WebBrowser [{EF99BD32-C1FB-11D2-892F-0090271D4F88}]
HKLM\SOFTWARE\Microsoft\Windows Media\Wmsdk\Sources [F3PopularScreenSavers]
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\5.0\User Agent\Post Platform [FunWebProducts]
Value Found : HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\User Agent\post platform [FunWebProducts]
Value Found : HKLM\SOFTWARE\Mozilla\Firefox\Extensions [[email protected]]
-\\ Internet Explorer v7.0.6000.17123[OK] Registry is clean.-\\ Mozilla Firefox v18.0.2 (en-US)File : C:\Documents and Settings\Linda\Application Data\Mozilla\Firefox\Profiles\4m0tdyk6.default-1362413021928\prefs.js[OK]File : C:\Documents and Settings\Linda\Application Data\Mozilla\Firefox\Profiles\mk3d46z1.default\prefs.js[OK]File : C:\Documents and Settings\Mason & Bailey\Application Data\Mozilla\Firefox\Profiles\id9e17ft.default\prefs.jsFound : user_pref("extensions.mywebsearch.openSearchURL", "hxxp://search.mywebsearch.com/mywebsearch/opensea[...]Found : user_pref("extensions.mywebsearch.prevKwdEnabled", true);
Found : user_pref("extensions.mywebsearch.prevKwdURL", "data:text/plain,keyword.URL=hxxp://search.yahoo.com/[...]File : C:\Documents and Settings\Steve\Application Data\Mozilla\Firefox\Profiles

I assume you mean the site of www.yahoo.com .

Clear the cache and cookies from sites that cause problems.

"Clear the Cache":

Tools > Options > advanced > network > content caching Web: 'clear now '.

'Delete Cookies' sites causing problems:

Tools > Options > privacy > Cookies: "show the Cookies".

Start Firefox in Safe Mode to check if one of the extensions (Firefox/tools > Modules > Extensions) or if hardware acceleration is the cause of the problem (switch to the DEFAULT theme: Firefox/tools > Modules > appearance).

Do NOT click on the reset button on the start safe mode window or make changes.

Also, make sure that your security (firewall, antivirus) software is not blocking content.

Everytime I open Firefox I get a message: "an attempt to change your home page has been blocked" and firefox crashes

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