User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.86 Safari/537.36 Steps to reproduce: 1. Open attached file in Firefox 42.0 Not reproduced on: - Firefox <= 32 or - Any zoom scale, "Actual zoom" or "Page width" view mode Actual results: Error "There was an unexpected problem while printing" Expected results: Print dialog must be shown

Reproduced with Firefox 43 beta 5 under Win 7 64-bit. With latest Nightly 45.0a1 and Aurora 44.0a2 the issue no longer occurs. Confirming for current beta.

Interesting, I can reproduce 43b5 having the issue but not DevEdition 44 (both with and without e10s enabled), but on trunk, the testcase WFM going back a long ways. Makes tracking it down with mozregression a pain.

I noticed that in 44.0a1 the issue only reproduced in non e10s windows, so I narrowed it down to: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=c8e325eee9e1&tochange=5bd6e09f074e and https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=27253887d2cc&tochange=5bd6e09f074e - the culprit seems to be bug 1064496. What seems to have fixed it in 44.0a1 is bug 1214766: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=01e37977f8da2e1f8b9ce9b777e556ffb1437960&tochange=e8c7dfe727cd970e2c3294934e2927b14143c205 https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=a0e7e27c0872696dd10708b96198f7fe19941c52&tochange=e2ee8f447aa139ac476058c1f8d657bcc0ade30f

Verified fixed in FF44/45. Regressed by bug 1064496: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=27253887d2cc&tochange=5bd6e09f074e Fixed by bug 1214766: https://hg.mozilla.org/integration/fx-team/pushloghtml?fromchange=799c8a9e33e0e12cb6c6ef488a3a5e57d8c98388&tochange=c48c3ec050125f4669aec1cb8d93e4955f432bd2