Make the copy before you move
Open My List and choose Create backup. The text box contains the saved title references and checkpoints currently held by this browser. Copy the complete text and keep it somewhere you can find it. It does not contain movie files, a viewing subscription or an external account password. Make a fresh copy after substantial changes to your list.
Merge without replacing existing checkpoints
In the receiving browser, paste the complete text into Restore backup and choose Merge backup. The tool keeps checkpoints already present there. This protects a newer stopping point from being replaced by an older backup. Review the resulting list and adjust any episode manually on its series page if needed.
If the backup is rejected
Check that the text is complete and belongs to this brand’s list format. Do not remove fragments at random to force it to load. An empty or incomplete copy may be missing the references you intended to keep. If the original browser is still available, generate another backup there. Clearing its storage first can remove the list you need.