Unchecked runtime.lastError while running tabs.insertCSS: Cannot access a chrome:// URL

[unix-junkie]

At line 2 of:

chrome.browserAction.onClicked.addListener(function(tab) {
    chrome.tabs.insertCSS({
        file: "style_smoothing.css"
    });
});

Stack trace:

background.js:2 (anonymous function)

My Chromium version is:

Chromium 44.0.2388.0 (Developer Build) (32-bit)
Revision a0b121b54f40978bc03086fc771ba969b4bb7d1e-refs/heads/master@{#327699}

Bump. I'm getting this in a browser running a slightly newer version of Chromium as well (Version 49.0.2623.108 at the time of this post.) I'm guessing they've changed how exactly that particular function works? I don't know enough about how chrome extensions function to have any idea how to fix this though. :-(

[unix-junkie]

The extension does work actually.

You only need to enable the chrome://flags/#extensions-on-chrome-urls flag and re-launch the browser (more info here).

Probably it makes sense to add this to the Release Notes.