In Safari, when the editor opens, the viewport jumps down past the site navigation header. This does not happen in Firefox or Chrome. It might be biased by having mainly used Firefox as my default browser past year (and Chrome before that), but I found it more natural for it to not scroll down (like we do in Firefox) as it meant the visual context is more preserved. In Chrome and Safari, it felt odd for the content to "jump down". Especially since this curently only happens after the end of the loading bar is reached.