Firefox Dev doesn't launch with profile imported from Nightly
I've copied the root profile folder from my old machine, created a new profile running Nightly, put the contents of old profile into just created one, and it just worked. Doing the exact same steps with Dev version doesn't work - app refuses to launch after picking imported profile as default one. Could it be because Dev has a lower app version?
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Downgrading a profile is not officially supported and can produce unpredictable results but you can override it with the --allow-downgrade command line argument.
Note that you shouldn't use a Nightly profile with a release version as those are not compatible. Instead you can transfer important data files.
- bookmarks and history: places.sqlite
- favicons: favicons.sqlite
- bookmark backups: compressed .jsonlz4 JSON backups in the bookmarkbackups folder
- cookies.sqlite for the Cookies
- formhistory.sqlite for saved autocomplete Form Data
- logins.json (encrypted logins) and key4.db (encryption key/primary password) for logins saved in the Password Manager
- cert9.db for certificates stored in the Certificate Manager
- persdict.dat for words added to the spell checker dictionary
- permissions.sqlite for Permissions and possibly content-prefs.sqlite for other website specific data (Site Preferences)
- sessionstore.jsonlz4 for open tabs and pinned tabs (see also the sessionstore-backups folder)
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