I searched much for that and getting only Firefox-specific solutions: ADD-ONs! I’ll surely not do that!
I’m asking you for the most secure way, that is will not affect Tor Browser security or privacy a cent!
Also, do you know how to make “.onion available” button not show at all?
I think you get it: I do not want anyone looking at my monitor to know I’m using Tor Browser. I think a Topic that should be heavily discussed before. I don’t know why I can’t find any.
Ways: Whether change or remove icon of about:newtab
, or make new tab button (or Ctrl+T) opens about:blank
instead which doesn’t show an icon next to “New Tab” already. Or any other way that will get the target done.