flake: bump inputs

And migrate firefox extensions configuration to the profile-specific
format.

home/firefox/default.nix

@@ -63,8 +63,6 @@ in
           "signon.rememberSignons" = false; # Disable built-in password manager
           "ui.systemUsesDarkTheme" = true; # Dark mode
         };
-      };
-    };
 
         extensions = with pkgs.nur.repos.rycee.firefox-addons; ([
           bitwarden
@@ -80,4 +78,6 @@ in
         ++ lib.optional (cfg.ff2mpv.enable) ff2mpv
         );
       };
+    };
+  };
 }