To disable (or enable) right-click context menu in Firefox you can open about:config in new tab and find dom.event.contextmenu.enabled option. You can change the value simply by double click.
I've found nicer invoice template. It's defined in files:
It's heavily customizable, so you probably wouldn't need change those files.
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Ten kto umie pisze kod, ten kto nie umie pisze książki..., albo blog.
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