I'm sorry to hear that you're experiencing issues with your wifi printer in Firefox. To troubleshoot this, let's try a few steps. First, ensure that your printer is turned on and connected to the same wifi network as your computer. Next, check if any recent updates or changes to Firefox might be causing the problem. You can try restarting Firefox or even your computer to see if that resolves the issue. If the problem persists, try clearing your browser cache and cookies, as sometimes this can affect printer communication. Also, make sure that your printer's drivers are up to date. If none of these steps work, you can reach out to the Mozilla support community or the printer manufacturer for further assistance. I hope these suggestions help you get your wifi printer working with Firefox again. Let me know if you need further help.