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Forgive me if I don't phrase this correctly, I'm a novice...

Is there a way to edit Exif info in local photos with this extension? What is the best way to do this? Would it be possible to create new fields in the Exif header post-process?

Ta opinia jest o wcześniejszej wersji dodatku (0.4). 

No, there's no way to write to photos using FxIF and there won't be in future. There is a lot software for editing image meta data but that's overkill for a browser extension I think.