Mozilla plans to change the backend for the storage.local API to indexedDB from JSON to improve performance in Firefox 63. The migration happens in the background and Firefox users who run Firefox 63 should not notice any issues afterward.
Problems may arise however if users downgrade Firefox to an earlier version or switch to a channel that is not yet at Firefox 63 or newer.
The change will land in Firefox Nightly first and if users load the Beta or Stable version of Firefox with the Nightly profile, they may run into data regression issues with extensions installed in the browser.
Mozilla revealed the change on the organization's Add-ons blog that it uses to inform developers of extensions for Firefox about upcoming changes and new features.
If your users switch between Firefox channels using the same profile during this time, they may experience data regression in the extensions they have previously installed.
Mozilla recommends that users don't downgrade from Firefox 63 in any form (be it by installing an older version and running it, or running an older version that is installed already using the same profile).
You can do the following to find out if the storage API has been migrated already to the new storage format:
Mozilla published instructions on re-migrating the extension data should it not be there after the migration. Note that it requires quite a few steps including removing the extension from Firefox and reinstalling it.
If you need to run different Firefox channels, use different profiles (and you can even run the profiles simultaneously). You can copy profile data from one profile to the other to create copies if you want to work with the same data set.Advertisement
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