Cursor being moved when typing

Created by: redbassett

Starting about a week ago, the extension causes my cursor to jump when I type the first character in a new line. On some sites/input boxes (Facebook Chat message fields, the new note field on Google Keep, and the message compose box in Google Inbox, to name a few), the cursor gets moved back to the start of the line when typing the first character on a blank line:

Expected result:

Hello World

Actual Result:

ello WorldH

When I type the H in a new line, the cursor gets bumped back to the start of the line. If I finish the line and go back, the H can be added fine. Running Chrome Dev 58.0.3018.3 (Official Build) dev (64-bit)