What I did to migrate open tabs and history (root required):
- opened IronFox and opened one tab
- force-stopped both Mull and IronFox
- using
https://github.com/zhanghai/MaterialFiles #MaterialFiles as a root explorer, I:
- went to /data/data/org.ironfoxoss.ironfox/files/
- removed places.sqlite-shm and places.sqlite-wal
- screenshat the permissions, owner, group and SELinux Context of places.sqlite and mozilla_components_session_storage_gecko.json
- removed both places.sqlite and mozilla_components_session_storage_gecko.json
- went to /data/data/us.spotco.fennec_dos/files (Mull's folder)
- copied places.sqlite and mozilla_components_session_storage_gecko.json
- went back to /data/data/org.ironfoxoss.ironfox/files
- pasted places.sqlite and mozilla_components_session_storage_gecko.json from the Mull's folder
- changed their permissions, owner, group and SELinux Context to what I screenshat before (owner and group is the IronFox app, SELinux Context is the same on both files, read-write permissions differ)
- opened IronFox, the history and open tabs were migrated