This extension uses the Chrome/Firefox extension APIs to pull data from the Jira API while you're logged into a Jira instance. It doesn't pass any auth tokens or cookies around. It just makes some API calls in the current page and uses the data to create a new tab with the requested graph.
The tool this is based on uses Graphviz on a server to generate the graph. Graphviz has been ported to JavaScript for client-side graphing, but the repo is archived and the author recommends another library.
The alternative listed is called Dagre, and this tool uses it and Dagre D3 (based on D3.js) for rendering.
I'm still having issues with graphing a DAG of Jira tickets, but I may end up trying some other D3 implementations I've found online:
- d3-dag
- d3-hierarchy
- d3-stratify
- d3-dag-visualization (based on Dagre)