Computer Help and Support

Will include the last known active session, and other information including profile settings and bookmarks. As long as the profile is not corrupt, pasting the contents into a newly installed Firefox’s profile folder after the first start of the new Firefox will restore the last known state assuming there are not too many versions that have come between it and the latest install which would cause a major incompatibility and prevent data from being imported for safety reasons. If they do not open exactly as they were, do not close the newly opened window after the folder is pasted, but instead choose to restore the last open session tabs from history. Menu > History > Restore Previous Session > (assuming you only had one window open it will be listed there). The contents are in sessionstore.jsonlz4 and previous.jsonlz4, manual extraction is possible via script, possibly extensions, regex, or manually hunting http addresses from the list, but it requires more effort.