Lots of other threads on this search, "PRINT USING SYSTEM DIALOG"

Firefox 97-100 did not have a setting to skip the built-in preview/setup overlay and automatically show the system print dialog. Firefox 101 now has one. Here's how you can try it out:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

More info on about:config: Configuration Editor for Firefox. The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future.

(2) In the search box in the page, type or paste print.prefer_system_dialog and pause while the list is filtered

(3) Double-click the preference to switch the value from false to true

If you need to restore the default display, you can call up the preference and double-click again to toggle the value back to false. There's also will be a reset arrow at the right end of the row when the preference has a non-default value.

Thank you! I had been reading other questions regarding this and the other answers pointed toward print.tab_modal.enabled, which appears to have been deprecated. We need to get this post higher in the search results.

Hi Druce, that option just became available yesterday, so it's going to take time to get updated in the numerous other threads.

WARNING: Changing preferences through this interface not officially supported Hidden settings edited using the about:config tool are explicitly not supported, which means that Mozilla makes no guarantees they will be supported in the future, or that Mozilla will fix them if they break. Mozilla does not test these preferences, and will not in the future. That includes security and performance testing which these preferences may affect.