Discuss move to Firefox ESR

On https://blog.torproject.org/blog/new-tor-browser-bundles-16 I noticed the following comment:

Why not using Firefox ESR? https://www.mozilla.org/en-US/firefox/organizations/faq/

Less often new Firefox "features" which often have a detrimental effect on anonymity.

I decided to copy it here so we can discuss the implications of this choice. Keep in mind that ESR's will still get security updates.

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