This script allows you to mark conversations (chats) as favorites.
This way, you can easily access them without scrolling through all existing chats to find the one you need.

How to use it:

Two "pin" icons will appear: one in the top left panel and one in the top right of the the page.

• Clicking the left icon will show a popup with your already pinned chats. You can close this popup by pressing the "Escape" key.
• Clicking the right icon allows you to add the currently open chat to your pinned ones.

The script is simple, so feel free to modify it if needed.