Are you sure better canvas is causing this? I don't know of anything in the code that would prevent you from submitting an assignment. If you mean the submit button is missing, then check your dark mode colors - they may all be the same color which could make it appear like the button is missing.

Hi Aris, I'm not sure why Firefox does this, but it defaults the extension permissions to "on click" so you have to click on the extension icon to start it. If you right click on the icon and select "always allow" it should fix this issue