firefox: edit specific saved form info

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Hi I been searching for this for a while. How can I edit what saved form info is there? Some are obviously useful but I dont want CC#'s and private addresses saved. Is there an extension or something that would allow me to selectivily erase entries? I dont want to clear everything every time.

I know I can use "SHIFT+DEL" to erase some entries but that is very time consuming and hard since I need to browse back to every page I need to do this on.

Thanks in advance.