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where can I download Firefox ESR 52 ? I am running Vista

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I was running ESR and it updated automatically and now the browser won't start.

I was running ESR and it updated automatically and now the browser won't start.

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You can download the ESR version from here :
https://www.mozilla.org/firefox/organizations/all/
Would you also take a look at this, please : https://blog.mozilla.org/futurereleases/2016/12/23/firefox-support-for-xp-and-vista/