The text boxes are always in insert mode, no matter how many times I hit INSERT on my keyboard.
Reporter, please include exact steps to reproduce your bug. Also include a URL or testcase where this occurs and your build id, thanks for testing mozilla
FYI: This doesn't work in netscape either, but does in IE.
i think this is a feature request rather than a bug - most apps don't have an overwrite mode for text entry, although as you say, IE does. confirming as a RFE (I guess form controls is the right place...)
*** This bug has been marked as a duplicate of 94529 ***
oops... missed that one when I was searching. verified dupe.