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Why firefox ESR is updated to quantum

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I have updated the firefox ESR to Quantum I install version 60.1 I have installed Quantum

I have updated the firefox ESR to Quantum I install version 60.1 I have installed Quantum

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The legacy Firefox 52.9.0 ESR is End Of Life Or EOL with no more updates as 60.2.0 ESR is the current ESR now.

Quantum refers to Firefox 57.0 and later.

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