Firefox Rounding Time Values Differently Than Other Browsers

Hi, I'm seeing a strange issue in Firefox when using an online work-hours calculator for payroll calculations. On this page: [https://mauricettecalcul.fr/ https://mauricettecalcul.fr/] When I enter certain hour and minute values and convert them to decimal hours, Firefox occasionally returns a slightly different rounded result compared to Chrome on the same machine. Because these figures are used for payroll, even small rounding differences can be problematic. I've already tried clearing the cache and testing with extensions disabled, but the behavior remains. Has anyone experienced browser-specific rounding or calculation differences in Firefox with JavaScript-based calculators? Is there a way to identify whether this is a Firefox issue or something related to how the site handles numeric calculations? Thanks for any suggestions.