@andyli, thanks for your PR! By analyzing the history of the files in this pull request, we identified @alexandrudima and @rebornix to be potential reviewers.

I've tested it on Fedora 26 and it works as intended: 'monospace' results in Liberation Mono just as 'Courier New' did. The problem is that if Courier New is really installed, it will look terrible (I guess because it was designed with Windows' hinting algorithm in mind, not FreeType's), see #5742 (comment). @Tyriar mentioned that monospace doesn't help, but according to #5742 (comment) that seems to be a Chromium bug and should be fixed by adding single-quotes around it just like this PR does :)

@Tyriar I see you would also like to test things out. This PR looks good to me. Please feel free to merge once you had a chance to review.

Yes I wanted to test this on a few distros to verify, targeting October 😃