I found out the actual reasons why Safari isn't good on OS.

[Benvisions]

I have updated research that people with Firefox are going to hate what I'm going to say, but it's true (credit to Placeholdername for this issue, here is their forum about it: https://onlinesequencer.net/forum/showth...p?tid=7016):
Firefox browsers don't load Online Sequencer anymore, which is a big bummer for Firefox. The mechanics didn't fix the bugs related to these problems at all yet. This also applies to Safari.

This is another reason why a Chromium product is recommended (e.g. Chrome, Brave, Opera, and Edge).

Also, this is not as related but Opera and Brave have ad-blockers, for those who hate ads or those who hate downloading ad-blocker extensions. This can cure the annoying ads.

[tbyunomi]

Dang

Thanks Ben for doing all of this research