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Hide Messenger Web chat list
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This script enhances the Facebook Messenger Web chat list with a dynamic resizing feature. Initially, the chat list remains hidden, but it becomes visible when you hover over the sidebar. Upon first interaction, a red resize handle appears on the right side of the chat list. After you drag this handle to adjust the width, the handle turns transparent, indicating that resizing has occurred. The script saves your preferred width using localStorage, ensuring that your adjustments are retained across future sessions. Additionally, sessionStorage tracks whether the chat list has been resized at least once. This setup provides a more personalized and efficient way to manage the chat list's size while maintaining a clean interface.