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Works in 7.0.1 after dragging button to toolbar. Rated 4 out of 5 stars
Got Firefox 7.0.1 today, used review directions to get Barcode button back click View > Toolbars > Customize, then drag the Barcode button to your preferred position on your toolbar. Works great.This review is for a previous version of the add-on (0.3.0.1-signed).