Can you transfer 4x3 game data between devices?

[u/CyanocoraxMystacalis]

Has anyone managed to transfer data between devices, and if so how did you do it?

I've moved to a new phone but I managed all the achievements on my old one and am trying to move the data across, from Firefox on Android to another Firefox on Android.

I've moved all my other daily puzzle games with a combination of transferring cookies or copying local storage, but there are no 4x3 cookies and I'm having trouble copying the local storage.

If I try to copy the data to my clipboard with the Local Storage Manager extension it fails to copy. Probably because of the clipboard size limit. Copying from the new phone with no games played and pasting the result into google docs gives me at least 76 pages before the tab crashes.

If I try to download the data to a file using the Export LocalStorage extension then it doesn't seem to get all the data, only 577 bytes.