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Family History

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Hi I subscribe to Campanies like Ancestry, MyHeritage and Find My Past to help with my research. They send "hints" to the RootsMagic software I have on my computer. Clicking the relevant button then normally takes me to online information about the people I am researching. However clicking on the Find My Past button always results in an error meassge: statusCode 400 error "Bad Request" message "Invalid cookie header"

On contacting Find My Past they just say it is probably a browser problem. I have tried deleting Firefox and re-installing it but I continue to get the same error messages.

Any help would be much appreciated please. Regards Peter

[removed email from public]

Hi I subscribe to Campanies like Ancestry, MyHeritage and Find My Past to help with my research. They send "hints" to the RootsMagic software I have on my computer. Clicking the relevant button then normally takes me to online information about the people I am researching. However clicking on the Find My Past button always results in an error meassge: statusCode 400 error "Bad Request" message "Invalid cookie header" On contacting Find My Past they just say it is probably a browser problem. I have tried deleting Firefox and re-installing it but I continue to get the same error messages. Any help would be much appreciated please. Regards Peter [removed email from public]

Okulungisiwe ngu James

Isisombululo esikhethiwe

This issue can be caused by corrupted cookies or blocked cookies.

  • check the permissions for the domain in the currently selected tab in "Tools -> Page Info -> Permissions"

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings).

"Remove the Cookies" for websites that cause problems:

  • Settings -> Privacy & Security
    Cookies and Site Data: "Manage Data"

"Clear the Cache":

  • Settings -> Privacy & Security
    Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear

If clearing the cookies doesn't work then try "Forget About This Site" or remove cookies.sqlite in the Firefox profile folder.


You can remove all data stored in Firefox for a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox for this domain like history and cookies and passwords and exceptions and cache, so be cautious. If you have a password or other data for that domain that you do not want to lose then make sure to backup this data or make a note.

You can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website then data for that website will be saved once again.

You can use the button on the "Help -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page (Root directory).

Funda le mpendulo ngokuhambisana nalesi sihloko 👍 1

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Isisombululo Esikhethiwe

This issue can be caused by corrupted cookies or blocked cookies.

  • check the permissions for the domain in the currently selected tab in "Tools -> Page Info -> Permissions"

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings).

"Remove the Cookies" for websites that cause problems:

  • Settings -> Privacy & Security
    Cookies and Site Data: "Manage Data"

"Clear the Cache":

  • Settings -> Privacy & Security
    Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear

If clearing the cookies doesn't work then try "Forget About This Site" or remove cookies.sqlite in the Firefox profile folder.


You can remove all data stored in Firefox for a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox for this domain like history and cookies and passwords and exceptions and cache, so be cautious. If you have a password or other data for that domain that you do not want to lose then make sure to backup this data or make a note.

You can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website then data for that website will be saved once again.

You can use the button on the "Help -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page (Root directory).