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This needs to e addressed
This is a major bug that nobody wants to address. Firefox is a wonderful browser but it considerably lacks in the area of printing wysiwyg.
I am currently working on a proprietary application that utilizes Firefox as the API. One of the requirements regarding this application is the ability to print out invoices from generated html.
There are other browsers that can handle print media. IE is the best at this but it is proprietary and a terrible engine as far as visual media. We are a LAMP shop.
I am literally begging you to address this issue. If you do, this will put you in the fore front as the browser of choice for application development. This is very different from web development
Wšykne wótegrona (1)
Firefox has a long history of "shortcomings" (bugs) with respect to printing. Certain widely used style rules for screen layout do not render well in print layout. There have been problems with position, overflow, and several other properties causing printouts to disappear after the first page, or appear only on later pages. If you search in Bugzilla, you can find a lot of open bug reports.
I think the problem here is that web developers have become adept at working around browser printing problems by offering print-formatted pages, using print style sheets, and generating PDFs. There simply isn't that much demand driving changes to the rendering engine. I suspect you also will conclude that one of these three workarounds is the most expedient solution. If you need assistance solving a particular layout problem, feel free to ask.