UserAgent: Mozilla/5.0 (X11; CrOS x86_64 7834.60.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.95 Safari/537.36
Platform: Mysterious request to install service handler when using ChromeVox

Steps to reproduce the problem:
1. Activate ChromeVox
2. Go to address bar (Ctrl L)
3. Go down (ChromeVox + Down)

What is the expected behavior?
Normal

What went wrong?
Every tab says "Press to search WR French English. This page wants to install a service handler."

It's not clear what the request means or where it is coming from. I checked and none of my tabs have the diamond icon which is supposed to be associated with a request to install a service handler.

Assuming WR means WordReference.com, I don't have any tabs for that site, although I did visit it in the past.

Did this work before? N/A 

Chrome version: 49.0.2623.95  Channel: stable
OS Version: 7834.60.0
Flash Version: Shockwave Flash 21.0 r0

ChromeOS 
Google Chrome	49.0.2623.95 (Official Build) (64-bit)

This started happening about two weeks ago, soon after upgrading to Chrome 49, though that could be coincidence.