Content Editor not displaying correctly in 5.4
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I've tried the dashboard resizing of the edit window (all the way down to 580px x 350px!) and she still can't get to the"update" button.
To fix it I went into Systems & Settings > Rich Text Editor. I changed my Tool Bar set from Advanced to Simple. Now the toolbar doesn't jump above the fold when I edit a content block.
Try changing your theme to one of concretes basic ones (Greek Yogurt)
and see if it makes a difference,
Also,
You are viewing the site via a browser, in your case "Firefox" and not directly via Windows NT, You could try another browser, Google Chrome for instance...
"/themes/swishmaster/css/960/reset.css"
Could be relevant..