This is a bug with overlay scrollbars, I believe it has been fixed but hasn't been picked up by a canary yet.

The fix should have been picked up by 59.0.3068.1. dhaddock@, the instructions just say that they disappear - that's intended. Do they reappear when you scroll?

Nope, when you scroll they don't come back.

I also did not see the scrollbars re-appear when scrolling.

Ok, thanks, I'll take a look when I get to a Chromebook

Note: Reproduces on Linux as well using the "Reset" button.

This issue fixed at bd0fcfc50787bed5d42f1c8fab247234c1a6a20e

Your change meets the bar and is auto-approved for M59. Please go ahead and merge the CL to branch 3071 manually. Please contact milestone owner if you have questions.
Owners: amineer@(Android), cmasso@(iOS), gkihumba@(ChromeOS), Abdul Syed@(Desktop)

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This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

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This no longer needs to be merged as we've decided to disable the feature in M59.

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

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Removing Merge-Approved label as the feature's been disabled on beta branch.