I can confirm that feedback submitted via Firefox is received from the dashboard.
I have run a test using the newest version of Firefox and I received the confirmation message on both current and future UI.
![Screenshot 2022-06-15 at 07.44.14.png Screenshot 2022-06-15 at 07.44.14.png](https://community.meraki.com/t5/image/serverpage/image-id/24150iB92B18D1FC7D01C1/image-size/small?v=v2&px=200)
![Screenshot 2022-06-15 at 07.43.45.png Screenshot 2022-06-15 at 07.43.45.png](https://community.meraki.com/t5/image/serverpage/image-id/24149iCC46076BF3E39C73/image-size/small?v=v2&px=200)
Therefore you must have a local issue, try the usual, clearing cache, cookies, trying in incognito mode, disable extensions 1 by 1 to see if any are interfering with the process, and possibly reinstall the browser if needed?
Best wishes ✌️