[Affected versions]:

• 60.5.2esr
• 65.0.1
• 66.0b10
• 67.0a1 (2019-02-21)

[Affected platforms]:

• Windows 10 x64
• Windows 7 x64

[Steps to reproduce]:

1. Log in on https://mail.yahoo.com/
2. Create several folders
3. Select any mail and click on the Move button
4. Observe the content

[Expected result]:

• The scrollbar doesn’t overlap the content.

[Actual result]:

• The scrollbar overlaps the content.

[Regression range]:

• This doesn’t look to be a regression, reproducible way back to Fx 48.0a1; earlier on, the new Yahoo Mail was not supported, or builds are not available.

[Additional Notes]:

• Not reproducible on Ubuntu and OSx platforms.

This is a version of bug 764076. (The dialog here is an intrinsically-sized element with overflow-y:auto.)

Not reproducible on Ubuntu and OSx platforms.

Sort of true -- the text doesn't get overlapped on those platforms, but that's only because the scrollbars are less wide on those platforms, and Yahoo does specify 16px of padding to the right of the text here, which provides some "breathing room". So, if your scrollbar is less than 16px wide (as it is on Ubuntu/Mac), then you won't see the text being covered up. But some of that padding does get covered up due to bug 764076 (whereas it doesn't get covered up in Chrome).

Reproduced on the 68.0 build, the latest release build 69.0, the beta build 70.0b5 and Nightly build 71.0a1 (2019-09-12) on Windows 7 x64.

Reproduced on latest nightly 71.0a1 from 24 of September in Mac OS X 10_14_6