Thanks for the feedback and support! Disabling Firefox's ability to manage passwords can improve performance: https://bitwarden.com/help/disable-browser-autofill/

You can also use the following keyboard shortcut to autofill: "Ctrl/CMD + Shift + L → Auto-fill, press again to cycle through matching logins" and linked custom fields can be helpful if still experiencing auto-fill issues: https://bitwarden.com/help/auto-fill-custom-fields/#using-linked-custom-fields