Firefox Community Forum

I'm using the latest version of Firefox on macOS Tahoe. Over the past 2–3 days, Firefox has started behaving unexpectedly.

Issues:

   Firefox automatically creates additional Dock icons while I'm only using a single Firefox window. Even if I remove the extra icon, it reappears after some time.

   When I open a different Firefox profile, it launches under a new Dock icon instead of using the existing Firefox icon. As a result, I end up with three separate Firefox Dock icons simultaneously.

   Firefox also fails to play pronunciation audio on some dictionary websites (e.g., JapanDict). Clicking the speaker icon produces only a brief click with no spoken audio. The same pronunciation works correctly in Safari, suggesting a Firefox-specific issue.

Expected behavior:

   Firefox should use a single Dock icon (unless intentionally running separate app instances).

   Different profiles should not create unexpected duplicate Dock icons.

   Pronunciation audio should play normally, as it does in Safari.

Environment:

   macOS Tahoe (latest version)

   Firefox (latest version)

My firefox profile keeps showing as repeatedly being deleted then saved in one drive - see screenshot. It's using a lot of memory anyway - nearly 3GB currently with 10 tabs, i've tried most fixes on https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-or-cpu-resources

I don't think it used to do this repeated profile deleting thing - any suggestions?