Solutions tried but unsuccessful: 1. Checked page size. It is correct at (80 x 297mm) 2. Cleared browsing history, cache, site settings, etc from start of time. 3. I have put print_resolution to 0 in about:config 4. I have put scaling to 1 in about:config ([[https://support.mozilla.org/en-US/questions/1297631]]) 5. I have put shrink to true in about:config ([[https://support.mozilla.org/en-US/questions/1297631]]) 6. I have alternated values (1 and 9) of paper_data in about:config (https://support.mozilla.org/en-US/questions/1297631) 7. Uninstalled ticket printer driver, rebooted PC and then installed again (Xprinter XP-80C). 8. Uninstalled Firefox completely, rebooted PC and downloaded again from Firefox website. 9. I have tested on a Laser A4 printer from Firefox on that same PC. Works fine. 10. Attached is the scanned picture of print from Firefox 100. [https://drive.google.com/file/d/1fk7Ynq6shap-TNK4kIxRFHni8UZPBzty/view?usp=sharing Firefox 100] 11. Another attached contains the scanned picture of print (correct one!) when I re-installed Firefox 64 [https://drive.google.com/file/d/1BaZgeONOfManb2Xs3NvUOh_tAyuzywR1/view?usp=sharing link text]