If you want to save your character's html file to your hard drive, Netscape seems to work better. Many people have found that saving them as Word documents works well. For some browsers, the best way to save the character sheet is to select "print" and save in .pdf format.
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Two other great things about the tool is that the creator is happy for other people to download and modify it (and is keeping it online):
Of course, I am grateful to TSR/WOTC, who developed and own the game system and graciously allow others to work with it. This page, which will be continually under construction, is intended to help people begin enjoying adventure gaming. This and my other generators will stay online indefinitely despite the upcoming fourth edition.
And with many of us being fans of out of print D&D settings, I'd love to see some people putting up new versions of the Character Generator that help work with converted settings. Spelljammer might be a little bit tricky (as there are so many possible races that could be added on) but we have enough Mystara fans here that I'd be disapointed if I did not see a modified version of this on VoP, when the Mystara 3e project gets enough stuff done.
EDIT: Crossposted to the Mystara 3e Conversion Project and the Spelljammer 3e Conversion Project. (It would probably be best to discuss the setting-bespoke options over there, but feel free to talk about the modification process in this thread.)