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Release Notes tell you what’s new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the system requirements of this release.
52.0esr
Firefox Extended Support Release ESR
March 7, 2017
Version 52.0esr, first offered to ESR channel users on March 7, 2017
Changed
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Service workers and push notifications disabled
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WebAssembly disabled
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Non-flash plugins re-enabled (disabled in the regular 52.0 release)