Bulk-Archiver is a tool for Archiving conversations on Facebook messenger. Archiving a chat removes it from the view, but keeps searchable so that your messages aren't lost, but you get to remove clutter. There is no way to bulk archive conversations on facebook messenger currently, so this removes the hassle of having to manually click through each conversation to archive it.
You should install this extension and if:
In order to install the install, download this repo and go here. Enable developer mode and load the folder containing this code as an unpacked extension. You should then be able to run it on messenger.com.
Report any issues with this extension to this repository. Feel free to pull and submit requests if you would like to make improvements.