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Re: You cannot downgrade Firefox 55 profiles

On Fri, 4 Aug 2017 14:12:05 -0400, Caver1 <caver1@xxxxxxxxxxxx> wrote:

>"In short: If you want to switch to ESR, it may be a good time to do so 
>before the Firefox 55 release. You may alternatively create a backup of 
>the Firefox profile before you upgrade to Firefox 55, and restore it 
>after you install Firefox ESR on your system.

What is ESR?

>Mozilla notes that the organization changed the "on-disk format of 
>persistent storage in profiles" in Firefox 55, and that this change is 
>the reason why you cannot downgrade to an earlier version of Firefox 
>after you used the profile on Firefox 55 or newer."

Uninstall the current version and install an earlier version.
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