Issue 5386 - Do not include content.js in devtools panel This was working so far because the devtools panel simply does not receive any messages from either the content script or the background page via chrome.runtime.onMessage. But there's a bug in Firefox 55 now that's causing messages to come through. It turns out content.js is being included unnecessarily in the devtools panel. If we simply remove it, that fixes the issue.
Total messages: 6