You cannot downgrade Firefox 55 profiles


If you have upgraded a variation of Firefox to variation fifty five or more recent, you would not be capable to downgrade that variation of the browser later on on to an more mature variation.

Although Mozilla in no way definitely supported downgrades of the browser before, it was typically no challenge to downgrade a individual variation of the Firefox browser.

There are two primary use scenarios where by this happens: first, when a release variation of Firefox causes challenges, and when buyers use the exact same profile on diverse variations of the browser.

The first situation happens when Firefox buyers run into challenges immediately after an update of the Firefox browser. They may perhaps then put in the more mature variation of Firefox anew. Because Firefox picks up the default profile instantly, or yet another profile if you position it to it, it may perhaps be utilized instantly by the browser.

This can direct to some challenges concerning the profile, as new variations of the browser may perhaps introduce new functions or adjust some. The impact may perhaps be apparent on the more mature variation, but it typically would not lead to the browser to halt functioning wholly.

The next situation happens when you use diverse Firefox variations using the exact same profile. This is not advised as you may perhaps run into the exact same challenges explained earlier mentioned (as you swap concerning diverse release variations).

A bug report on Bugzilla@Mozilla highlights that profiles of Firefox fifty five or more recent would not operate in more mature variations of the browser any more.

Firefox fifty five is the subsequent release variation of the browser the planned release day is August eight, 2017. Although the data is useful in itself, it is in particular critical for buyers who plan to go to Firefox 52.x ESR when Firefox fifty seven will get launched in November as the profile would not operate then any more if they have installed Firefox fifty five, 56 or fifty seven at a single position in time.

In small: If you want to swap to ESR, it may perhaps be a very good time to do so before the Firefox fifty five release. You may perhaps alternatively produce a backup of the Firefox profile before you upgrade to Firefox fifty five, and restore it immediately after you put in Firefox ESR on your procedure.

Mozilla notes that the firm adjusted the “on-disk format of persistent storage in profiles” in Firefox fifty five, and that this adjust is the rationale why you are not able to downgrade to an before variation of Firefox immediately after you utilized the profile on Firefox fifty five or more recent.

At the time a profile has been utilized with Firefox fifty five (or later on), it must not be utilized with prior variations of Firefox. IndexedDB, the (DOM) Cache API, Assistance Staff, and the asm.js cache will all fall short to operate, generating complicated mistakes and causing portions of Firefox and some web sites to split. The profile can be built operable yet again in more mature variations of Firefox by using the profile “refresh” system.


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