Keep a copy before changing browsers
In My List, choose Create backup. Copy the complete text, including its opening and closing braces. It contains saved title identifiers and episode notes, not video files, payment information or account credentials.
Merge into the receiving browser
Open My List in the browser where you want the choices, paste the text into Restore backup and choose Merge backup. Recognised titles are added without duplicate saved entries. Existing checkpoints there take precedence over an imported older reminder.
The confirmation reports additions and skipped entries. A title not recognised in the current catalogue is not silently turned into another production. An unreadable or wrong-format backup is rejected without replacing the receiving list.
Private browsing and clearing website storage can discard local choices. Keep the backup outside that browser before a reset. A copied list is a useful handoff between your devices, but it is not a cloud account or a synchronised viewing history.