**Found in** * 154.0a1 **Affected versions** * 154.0a1 (2026-06-17) * 153.0b2 **Tested platforms** * Affected platforms: macOS 10.15, macOS 12 and macOS 13, 14, 16 (if the file name is changed) * Unaffected platforms: Windows 11 **Steps to reproduce** 1. Open a page and print it via PDF 2. On macOS 13+, change the name of the file (by default, it has .pdf at the end) ****Expected result**** * The .pdf format is added by default. **Actual result** * The .pdf format is not added. **Regression range** * Pushlog: https://hg-edge.mozilla.org/integration/autoland/pushloghtml?fromchange=2a0438e632b2a725d04730193c0740ed576a8675&tochange=4c36e48b14e36f3f453a4a57ca1eeb97b1b905f8 * mozregression points at bug 2038047 **Additional notes** * Attached a screen recording.
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**Found in** * 154.0a1 **Affected versions** * 154.0a1 (2026-06-17) * 153.0b2 **Tested platforms** * Affected platforms: macOS 10.15, macOS 12 and macOS 13, 14 (if the file name is changed) * Unaffected platforms: Windows 11, macOS 26 **Steps to reproduce** 1. Open a page and print it via PDF 2. On macOS 13+, change the name of the file (by default, it has .pdf at the end) ****Expected result**** * The .pdf format is added by default. **Actual result** * The .pdf format is not added. **Regression range** * Pushlog: https://hg-edge.mozilla.org/integration/autoland/pushloghtml?fromchange=2a0438e632b2a725d04730193c0740ed576a8675&tochange=4c36e48b14e36f3f453a4a57ca1eeb97b1b905f8 * mozregression points at bug 2038047 **Additional notes** * Attached a screen recording. * Does not reproduce on macOS 26