Как одновременно запустить Firefox 3 и 4?

Очень просто.

1. Ставим их в разные папки, к примеру: c:\Program Files (x86)\Mozilla Firefox и c:\Program Files (x86)\Mozilla Firefox 4.
2. Переименовываем профиль от трёшки в FF3: c:\Users\[username]\AppData\Roaming\Mozilla\Firefox\Profiles\FF3
3. Копируем его в папку FF4: c:\Users\[username]\AppData\Roaming\Mozilla\Firefox\Profiles\FF4
4. Правим c:\Users\[username]\AppData\Roaming\Mozilla\Firefox\profiles.ini:
   [Profile0]
   Name=FF4
   IsRelative=1
   Path=Profiles/FF4
   Default=1[Profile1]
   Name=FF3
   IsRelative=1
   Path=Profiles/FF3
5. Добавляем на таскбар, к FF3, иконку FF4.
6. Правой кнопкой, в свойствах значка для FF3 пишем: «"C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -P FF3 -no-remote», для FF4: «"C:\Program Files (x86)\Mozilla Firefox 4\firefox.exe" -P FF4 -no-remote».
7. Они даже могут работать одновременно!

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