URL: https://docs.google.com/document/d/1w50UH7XyChr4wbRkyRbl4pnKjk-HZ7Qumk_wxentFJE/edit

Browser / Version: Firefox 60.0
Operating System: Mac OS X 10.13
Tested Another Browser: Yes

Problem type: Site is not usable
Description: Regression: Cannot use backspace, arrow keys, or undo in google doc.
Steps to Reproduce:
Open google docs

open document

type in the editor

attempt to remove whatever I typed

gfx.webrender.all: false
gfx.webrender.blob-images: 1
gfx.webrender.enabled: true
image.mem.shared: 2

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