Astro is the only app which support Facebook group chat, sticker and attachment, in the Mac Store.
Features:
1. The only app which support group message
2. Sync your sticker set on Facebook
3. Privacy control, turn off chat to specified users
4. Drag & drop attachments
5. Utilized screen crop tool
6. Hot key to show conversation and crop screen.
7. Themes
Fix bug in opening video messages.