Not sure exactly what you are seeing. Giving more detail about when and where you see this will help.

If this is dropdown that shows entries you have used previously when completing an action in a text input field just select it and use the delete key.

If this is a true password if it autocompletes it should display as asterisks [*** ]

See also

• Password manager - Remember, delete and change saved passwords in Firefox
• Control whether Firefox automatically fills in forms

Thank you for answering, but it did not solve my problem. When I go to this certain page, my name and pincode are saved there. I want delete this. Deleting history and similiar actions do not help. Sorry for my poor english, I´m Swedish :)

Web pages may store information about you and that is often linked with cookies, so deleting any cookies for that website may help. Do not delete cookies for a site IF you are in the middle of actions on the site as you will be logged out when you clear cookies.

• Clear cookies and site data in Firefox_delete-cookies-for-a-single-site

You should not need to clear the cache to get the website to update but you may need to use Keyboard shortcut Ctrl F5 to refresh and reload fully. See also

• How to clear the Firefox cache
  • /sv/kb/Hur%20man%20rensar%20cachen
• Keyboard shortcuts - Perform common Firefox tasks quickly#w_navigation
  • en-US -> sv -> /sv/kb/Kortkommandon

I checked the articles I linked to in these posts. Sorry only two Swedish versions available. _{( ? no TOC Svenska )}

The only Swedish support I noted was a mailing list and associated group, but you seem to have no problems with English.

• https://lists.mozilla.org/listinfo/community-sweden
  • http://groups.google.com/group/mozilla.community.sweden