Thank you for doing that and I'm sorry that we're not tracking this printing failure as I would have hoped. Would you mind testing using mozregression to find exactly what changed that broke printing for you? https://mozilla.github.io/mozregression/ has information about how to download and run Mozregression. The tool will download different builds of Firefox for you to try, and after about 10 different builds it should be able to tell the exact change which caused printing to stop working for you. This would be of tremendous help to us.
Bug 1630095 Comment 12 Edit History
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Thank you for doing that and I'm sorry that we're not recording this printing failure as I hoped. Would you mind testing using mozregression to find exactly what changed that broke printing for you? https://mozilla.github.io/mozregression/ has information about how to download and run Mozregression. The tool will download different builds of Firefox for you to try, and after about 10 different builds it should be able to tell the exact change which caused printing to stop working for you. This would be of tremendous help to us.