Create a copy before changing devices
Open Watchlist in the browser that contains your saved titles. Select Create backup, then copy the complete text into a private note or text file. Keep the opening and closing characters intact. The text holds references and checkpoints, not movie files or a copy of the whole website.
Merge the list in another browser
Open MovieCrumbs there, visit Watchlist, paste the saved text into Restore backup, and select Merge backup. Valid title references are added. Existing checkpoints in that browser are preserved rather than silently replaced by an older backup.
If the backup is rejected
Check that you copied the entire text and that it came from the MovieCrumbs backup tool. A backup from another brand is a different format. Unsupported or malformed text is rejected rather than treated as executable content. Keep the original copy while checking the problem.
Shared devices
Anyone using the same browser profile may see your saved choices. Store backups where you want to keep that information. Clearing website data can remove the local list, so make the copy first. Open Watchlist to create or merge a backup.