We have recently learned that people who’ve installed [https://www.ccleaner.com/ CCleaner] may lose the saved settings of Firefox extensions they have installed after upgrading to Firefox 79. This is due to a [https://blog.mozilla.org/addons/2020/07/09/changes-to-storage-sync-in-firefox-79/ recent update] in Firefox that creates a new sqlite file and two supporting companion files within your profile to store synced extension data. When you run Firefox 79 for the first time, your extension storage data is automatically moved to the new file. CCleaner does not recognize the two new companion files and deletes them, which causes your extension settings to be lost. We’ve notified CCleaner of this issue and they are working on an update that will fix this problem. In the meantime, [https://community.ccleaner.com/topic/58613-problem-with-firefox-79-fixed-in-v570/?tab=comments#comment-321277ner CCleaner recommends] that you work around this issue by disabling one of the following cleaning options in CCleaner. =If you use Custom Clean= In the Firefox section, disable the Internet Cache setting. This affects Firefox cleaning only. =If you use Health Check= After analyzing, in the 'Privacy' section, disable the Temporary Internet Files option before completing a clean. This affects cleaning of Firefox and other browsers.

We have recently learned that people who’ve installed CCleaner may lose the saved settings of Firefox extensions they have installed after upgrading to Firefox 79.

This is due to a recent update in Firefox that creates a new sqlite file and two supporting companion files within your profile to store synced extension data. When you run Firefox 79 for the first time, your extension storage data is automatically moved to the new file. CCleaner does not recognize the two new companion files and deletes them, which causes your extension settings to be lost.

We’ve notified CCleaner of this issue and they are working on an update that will fix this problem. In the meantime, CCleaner recommends that you work around this issue by disabling one of the following cleaning options in CCleaner.

If you use Custom Clean

In the Firefox section, disable the Internet Cache setting. This affects Firefox cleaning only.

If you use Health Check

After analyzing, in the 'Privacy' section, disable the Temporary Internet Files option before completing a clean. This affects cleaning of Firefox and other browsers.