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[Fx55] Profile issues after downgrade from Firefox 55+ to Fx52 ESR

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  • Last reply by AliceWyman
  1. AliceWyman 4747 posts
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    This came up in another thread:

    The Firefox 55 Beta release notes say, Breaking profile changes - do not downgrade Firefox and use a profile that has been opened with Firefox 55+. This will affect users running Firefox 55 who downgrade to Firefox 52 ESR. Related bug:

    Bug 1246615 - Make Firefox explicitly aware when running a profile from future. ... links to other related bugs, including: Bug 1357428 Profiles used with Firefox 55 will no longer work with older versions of the browser (quote) Firefox 55 changed the on-disk format of persistent storage in profiles. Once a profile has been used with Firefox 55 (or later), it should not be used with previous versions of Firefox. IndexedDB, the (DOM) Cache API, Service Workers, and the asm.js cache will all fail to operate, generating confusing errors and causing portions of Firefox and some websites to break. The profile can be made operable again in older versions of Firefox by using the profile "refresh" mechanism.

    We should add a note to this article (and other articles that suggest downgrading from Firefox 55+ to an earlier version) that downgrading Firefox can cause various profile issues that can be resolved by refreshing Firefox.

    I'll make a new revision to add this note: {for fx55} {warning} By default, Firefox 52 ESR will use the same user profile data as other versions of Firefox. Installing Firefox 52 ESR after using Firefox version 55 or above can cause problems such as error messages, breakage in portions of Firefox and issues with some websites. You should either create a new profile to use with Firefox 52 ESR or else refresh Firefox after installing Firefox 52 ESR. {/for}

    This came up in [https://support.mozilla.org/en-US/kb/google-hangouts-temporarily-wont-work-on-firefox/discuss/7097 another thread]: The [https://www.mozilla.org/en-US/firefox/55.0beta/releasenotes/ Firefox 55 Beta release notes] say, ''Breaking profile changes - do not downgrade Firefox and use a profile that has been opened with Firefox 55+.'' This will affect users running Firefox 55 who downgrade to Firefox 52 ESR. Related bug: [https://bugzilla.mozilla.org/show_bug.cgi?id=1246615 Bug 1246615] - Make Firefox explicitly aware when running a profile from future. ... links to other related bugs, including: [https://bugzilla.mozilla.org/show_bug.cgi?id=1357428 Bug 1357428] Profiles used with Firefox 55 will no longer work with older versions of the browser (quote) ''Firefox 55 changed the on-disk format of persistent storage in profiles. Once a profile has been used with Firefox 55 (or later), it should not be used with previous versions of Firefox. IndexedDB, the (DOM) Cache API, Service Workers, and the asm.js cache will all fail to operate, generating confusing errors and causing portions of Firefox and some websites to break. The profile can be made operable again in older versions of Firefox by using the profile "refresh" mechanism.'' We should add a note to this article (and other articles that suggest downgrading from Firefox 55+ to an earlier version) that downgrading Firefox can cause various profile issues that can be resolved by [[Refresh Firefox - reset add-ons and settings|refreshing Firefox]]. I'll make a new revision to add this note: {for fx55}<!--https://bugzilla.mozilla.org/show_bug.cgi?id=1357428--> {warning} By default, Firefox 52 ESR will use the same [[Profiles - Where Firefox stores your bookmarks, passwords and other user data|user profile data]] as other versions of Firefox. Installing Firefox 52 ESR after using Firefox version 55 or above can cause problems such as error messages, breakage in portions of Firefox and issues with some websites. You should either [[Use the Profile Manager to create and remove Firefox profiles|create a new profile]] to use with Firefox 52 ESR or else [[Refresh Firefox - reset add-ons and settings|refresh Firefox]] after installing Firefox 52 ESR. {/for}
  2. AliceWyman 4747 posts
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    For what it's worth: https://www.ghacks.net/2017/08/02/you-cannot-downgrade-firefox-55-profiles/ https://www.reddit.com/r/firefox/comments/6r6kab/reminder_if_you_plan_to_downgrade_to_52_esr/
    Modified by AliceWyman on