inØsight is a fully open-source extension for people who want to send and receive texts without having the fear of being caught. 

If you're going to be making a lot of texts, then this tool can really help you to avoid being traced. It can also be used to obfuscate any message.

Features of the extension:

Hide text and make it impossible to read by anyone.

Texts can be hidden within zero-width spaces.

Obfuscate any text.

Detect and be notified about zero-width spaces and other invisible characters on the web.