UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0

Steps to reproduce the problem:
Start windows magnifier and make sure that follow the text cursor is selected under magnifier options1. 
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What is the expected behavior?
Zoom in when typing on a text field, When the cursor gets out of the zoomed in view port the view port doesn't move with the cursor as it should.  Strangely when a composition-based language such as chinese is used chromium emits the correct accessibility events and magnifier is able to follow the text insertion cursor

What went wrong?
i'm a low vision user so now everytime I zoom in on a text field/type I have to move along with the mouse otherwise I won't be able to see what i'm typing as magnifier doesn't receive the expected accessibility events.

Did this work before? N/A 

Chrome version: all<Copy from: 'about:version'>  Channel: n/a
OS Version: 10.0
Flash Version: