I am maintaining one extension for google chrome and I'm receiving complaints from random users saying that it just stopped working.
The error message in "extensions" section is this:
Chrome plugin - Permission chrome-devtools://*/* is unknown or URL pattern is malformed
It seems it's not a very popular issue - I wasn't able to find any trace of that. My permissions section of the manifest file looks like this:
"permissions": [
"tabs", "http://*/*", "https://*/*", "chrome-devtools://*/*"
]
And it works just fine for most people