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Safari has this built-in under "Develop->Enter Responsive Design Mode" (⌥⌘R). The Develop menu can be enabled from the Advanced tab of the Preferences window. F
by alexbock 10y ago
Safari has this built-in under "Develop->Enter Responsive Design Mode" (⌥⌘R). The Develop menu can be enabled from the Advanced tab of the Preferences window. Firefox appears to have a "Responsive Design View" (⌥⌘M) as well.