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Firefox window will not scale down past 420px wide

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For some reason on both my work Mac and home Mac I am unable to shrink my browser window past 420 - 425px wide. Both computers are using mavricks. It does not matter the website. I disabled all addons and toolbars. Updated me version. But have had no luck. Even if I try and resize viewport with developer tools the window will not shrink past 425px

For some reason on both my work Mac and home Mac I am unable to shrink my browser window past 420 - 425px wide. Both computers are using mavricks. It does not matter the website. I disabled all addons and toolbars. Updated me version. But have had no luck. Even if I try and resize viewport with developer tools the window will not shrink past 425px

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That was caused by a Bug fix for a new minimum width window size.

See this - https://support.mozilla.org/en-US/questions/980033#answer-510995