Hi @serodc. That visualization track for jbrowse is a custom thing that flybase made. I think they used code that they made for gbrowse and pre-rendered png tiles to create it. I have worked on jbrowse 1 plugin for similar multi-bigwig type rendering but did not try to replicate their code exactly. My approaches in jbrowse 1 culminated in making the multibigwig plugin (https://github.com/elsiklab/multibigwig). There is also wigglehighlighter which could replicate the little red boxes outlining the "peaks" https://github.com/cmdcolin/wigglehighlighter

JBrowse 1 development with plugins has gotten a little hard over the years, see https://jbrowse.org/docs/faq.html#how-do-i-use-plugins-with-jbrowse and make sure to use nodejs less than 14 e.g. just use 12 when running the setup.sh script.

You could also consider JBrowse 2, we have multibigwig (aka multiquantitativetracks) built-in https://jbrowse.org/jb2/docs/config_guides/multiquantitative_track/ so don't need to install any plugins

Disclaimer: I'm a jbrowse dev and wrote all the above jbrowse 1 plugins and jbrowse 2 code