Chrome Extension
- Developer Extensions
- Extending DevTools
- tabs.executeScript
- chrome.devtools.inspectedWindow
- chrome.devtools.panels
Other helpful resources:
- How to Write a Chrome DevTools Extension by Dominick Gendill
- Sample Extensions
- mdn/webextensions-examples
Firefox Add-ons debugging
Notes:
Because there’s poor visibility into content scripts, and the suck to reload, Make sure the connections are all wired up first.