i am waiting for any resolution

Hi mdraja78, The easiest method would be to open each instance of Firefox and use the built in Firefox features

• See Clear browsing history and cookies

Obviously as an Administrator on Windows you can do that from your Admin account. Using the Firefox options allows you to control exactly what is deleted. Using the Admin account itself is more of a Windows topic than a Firefox question. See for instance articles on runas

• https://en.wikipedia.org/wiki/Runas
• https://technet.microsoft.com/en-us/library/bb490994.aspx
• SevenForums > Tutorial: Windows 7: Run as Different User
  • Note that is a user friendly tutorial, with alternative methods and there are related discussion and support fora.

With more complex hacking you can remove the data from the database, or a much simpler method would be to just delete the database, but the problem is that database includes the bookmarks, and it gets more complicated to delete the History and retain all or most bookmarks.

thanks for your reply

actually i have more than 15 user account in one system and i am using admin account of my PC.

i want to delete mozilla firefox history, cookies etc. for all user account from my admin account.

please help for the same.

Are you trying to explain that you want to clear all Firefox data for all those other accounts. Remember (I think with Windows 7 you may get some possibility of reversing a deletion) this tends to be rather drastic and will include deletion of passwords and bookmarks. If so delete the Firefox profiles for those other users.

Alternatively if you wish to reset all that data by creating a new profile, but leave a good possibility of recovering the old profiles if required then that can also be done, and I will explain if necessary.

 more than 15 user accounts in one system

I guess you have a large or extended family, or the PC is used for business purposes.

I do not know the background reasons for this request, and do not want to advise you to take action that you later regret. I do not for instance know whether you consider the data in other accounts to be of no value, or even to be data you wish to destroy because of confidentiality issues or whatever.

You can consider to delete the places.sqlite file in the (default) profile folder. This will remove the history and the bookmarks. Firefox should rebuild the bookmarks from the most recent backup in the bookmarkbackups folder on the next start.

• bookmarks-YYYY-MM-DD_<item-count>_<hash>.jsonlz4