i have unwhitingly received multipal accounts, i only want one account yet unable to find the first account.

I wouldn’t delete any of the accounts yet. Creating extra Firefox accounts would not normally remove your original bookmarks, passwords, or history, because that data can be stored in the Firefox profile on your computer.

The first thing I’d do is find the original Firefox profile and determine which Mozilla account it was using. Once that’s found, you can remove the extra accounts without risking the data you’re trying to recover. I also wouldn’t assume Google stole your passwords based on this alone.

If that's rather a "Profile" functionality that you might have used to create several local empty instances, check Manage Firefox profiles for the documentation.

If that seemed to happen on its own and you don't see your original one in the above, try to see if any profile might have gotten disconnected:

If Firefox starts up after an update without your bookmarks and other settings, check whether your data is available in a different profile:

Inside Firefox, type or paste about:profiles in the address bar and press Enter/Return to load it. The About Profiles page will open. This page should list at least one profile and could list many.

The profile that Firefox is currently using will show:
This is the profile in use and it cannot be deleted.

Please do not delete anything here; don't use any Remove buttons.

Do you have another profile named default or default-longnumber listed on this page? If so, you can check whether it is the one you were using recently by clicking its Launch profile in new browser button.

If it isn't what you want, simply close that new window.

If it IS what you want, click the Set as default profile button for that profile on the about:profiles page. Firefox will use it automatically at the next startup.

For more information see Recover user data missing after Firefox update or reinstall.

Note: If your bookmarks are not available in another Firefox profile, see Recover lost or missing Bookmarks for other solutions.