Rebase Tor Browser esr78 patches onto 80 beta

• #40069 (closed)
• torbutton#40002 (closed)
• torbutton#40003 (closed)
• torbutton#40004 (closed)
• torbutton#40005 (closed)
• #40074 (closed)
• #40076 (closed)
• #40084 (moved)