Make the copy while your list is available
Open My List and choose Create backup. Copy all the text in Your backup and keep it in a private note. It describes saved selections and checkpoints, not downloaded films. Make a fresh copy after important changes or before clearing browser data.
Merge into the other browser
Open My List there, paste the complete text into Restore backup and choose Merge backup. Matching titles are added without duplicates. Existing destination checkpoints remain in place, so an older copy does not silently replace a newer note.
Read the result message
The result tells you how many titles and checkpoints were added and whether entries were skipped. A removed or unmatched catalog entry may be unavailable. A message about unreadable text usually means the backup was incomplete or edited. Copy the original again rather than inventing missing punctuation.
Open My List to create or restore a copy. For a title you opened but never saved, check Recently browsed instead.