UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36

Steps to reproduce the problem:
1. (In an extension) Add a function to the background page that calls chrome.webNavigation.onDOMContentLoaded.addListener() with the url parameter set to the argument passed to the function
2. Add something that calls the background page function with an array of urls

What is the expected behavior?
Replace this check
---    if (filters.url && !(filters.url instanceof Array))
to this one
+++    if (filters.url && !(Array.isArray(filters.url))

What went wrong?
The check `!(filters.url instanceof Array)` inside EventImpl.prototype.addListener() method works correctly only if `filters.url` is an array created by that page's original Array constructor.

WebStore page: 

Did this work before? N/A 

Chrome version: 55.0.2883.87  Channel: stable
OS Version: 
Flash Version: Shockwave Flash 24.0 r0

I've created an example extension to help in locating the issue.
 

Deleted: test.zip 1.4 KB

test.zip 1.4 KB Download