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The following is a changelog for JavaScript features in Firefox releases.
Firefox 40
{{page('en-US/docs/Mozilla/Firefox/Releases/40','JavaScript')}}
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Firefox 39
{{page('en-US/docs/Mozilla/Firefox/Releases/39','JavaScript')}}
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Firefox 38
{{page('en-US/docs/Mozilla/Firefox/Releases/38','JavaScript')}}
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Firefox 37
{{page('en-US/docs/Mozilla/Firefox/Releases/37','JavaScript')}}
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Firefox 36
{{page('en-US/docs/Mozilla/Firefox/Releases/36','JavaScript')}}
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Firefox 35
{{page('en-US/docs/Mozilla/Firefox/Releases/35','JavaScript')}}
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Firefox 34
{{page('en-US/docs/Mozilla/Firefox/Releases/34','JavaScript')}}
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Firefox 33
{{page('en-US/docs/Mozilla/Firefox/Releases/33','JavaScript')}}
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Firefox 32
{{page('en-US/docs/Mozilla/Firefox/Releases/32','JavaScript')}}
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Firefox 31
{{page('en-US/docs/Mozilla/Firefox/Releases/31','JavaScript')}}
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Firefox 30
{{page('en-US/docs/Mozilla/Firefox/Releases/30','JavaScript')}}
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Firefox 29
{{page('en-US/docs/Mozilla/Firefox/Releases/29','JavaScript')}}
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Firefox 28
{{page('en-US/docs/Mozilla/Firefox/Releases/28','JavaScript')}}
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Firefox 27
{{page('en-US/docs/Mozilla/Firefox/Releases/27','JavaScript')}}
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Firefox 26
{{page('en-US/docs/Mozilla/Firefox/Releases/26','JavaScript')}}
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Firefox 25
{{page('en-US/docs/Mozilla/Firefox/Releases/25','JavaScript')}}
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Firefox 24
{{page('en-US/docs/Mozilla/Firefox/Releases/24','JavaScript')}}
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Firefox 23
{{page('en-US/docs/Mozilla/Firefox/Releases/23','JavaScript')}}
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Firefox 22
{{page('en-US/docs/Mozilla/Firefox/Releases/22','JavaScript')}}
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Firefox 21
{{page('en-US/docs/Mozilla/Firefox/Releases/21','JavaScript')}}
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Firefox 20
{{page('en-US/docs/Mozilla/Firefox/Releases/20','JavaScript')}}
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Firefox 19
{{page('en-US/docs/Mozilla/Firefox/Releases/19','JavaScript')}}
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Firefox 18
{{page('en-US/docs/Mozilla/Firefox/Releases/18','JavaScript')}}
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Firefox 17
{{page('en-US/docs/Mozilla/Firefox/Releases/17','JavaScript')}}
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Firefox 16
{{page('en-US/docs/Mozilla/Firefox/Releases/16','JavaScript')}}
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Firefox 15
{{page('en-US/docs/Mozilla/Firefox/Releases/15','JavaScript')}}
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Firefox 14
{{page('en-US/docs/Mozilla/Firefox/Releases/14','JavaScript')}}
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Firefox 13
{{page('en-US/docs/Mozilla/Firefox/Releases/13','JavaScript')}}
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Firefox 12
{{page('en-US/docs/Mozilla/Firefox/Releases/12','JavaScript')}}
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Firefox 11
{{page('en-US/docs/Mozilla/Firefox/Releases/11','JavaScript')}}
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Firefox 10
{{page('en-US/docs/Mozilla/Firefox/Releases/10','JavaScript')}}
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Firefox 9
{{page('en-US/docs/Mozilla/Firefox/Releases/9','JavaScript')}}
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Firefox 8
{{page('en-US/docs/Mozilla/Firefox/Releases/8','JavaScript')}}
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Firefox 7
{{page('en-US/docs/Mozilla/Firefox/Releases/7','JavaScript')}}
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Firefox 6
{{page('en-US/docs/Mozilla/Firefox/Releases/6','JavaScript')}}
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Firefox 5
{{page('en-US/docs/Mozilla/Firefox/Releases/5','JavaScript')}}
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Older versions
For versions prior to Firefox 5, see the old JavaScript versions.