[header] How to change chat colors and emoji in facebook messenger [title] Open the conversation in messenger that you want to change colors for. [step] You can change the chat color for any of your messenger conversations. The new color will replace the conversation header color as well as the chat bubble color. 
The changes will be visible to everyone in the conversation. [substeps] The color change will only be visible in messenger; it will not apply to messages viewed through the facebook website.