Create the copy before changing browsers
Open My List and choose Create backup. Copy all the text from the output field into a note or document you can retrieve. It includes recognized title identifiers and episode reminders, not your account credentials or movie files. Make a fresh copy after adding important choices.
Merge without replacing the receiving list
On the same website in the destination browser, paste the complete text into Restore backup and choose Merge backup. Recognized titles are added once. An existing checkpoint in the receiving browser is kept, so importing an older copy does not silently move your place backward.
Read the result message
The tool reports what it added and what it skipped. An incomplete paste is not readable backup data. A backup for another brand is not accepted as a LetMeWatchThis list. Unknown titles or invalid episode positions are skipped rather than turned into broken cards.
Keep a copy you understand
The text may reveal which films you saved, so store it somewhere appropriate on a shared device. This is a manual backup, not cloud synchronization. If you clear site data without a copy, the browser's local list may be lost. Check the imported list before removing your old browser profile.