For Dusk* / Classic skins (visit /userprefs.cgi and search for `Bugzilla's general appearance (skin)`)

TOC:

• header: minimize until hover
  
• bug's status and meta info: move right (so description and comments moves to top)
  
• comment textarea: move to bottom, under discussion (it could be already there in properly configured newer versions of Bugzilla)
  
• saved searches: move to the top
  
• search/filter list: autowidth
  
• block links in table;
  
• Visited links: distinguish
  
• comment textarea: dimensions (necessary form moving from top)
  
• comment textarea: differrent private state appearance
  
• br, hr: hide (cleanup)
  
• bug status: more contrast (emphasize)
  
• comment boxes: increased line-height (readability)