Images are not centered anymore in Tor Browser

https://blog.torproject.org/new-release-tor-browser-80a9#comment-275908 noted that images loaded in Tor Browser based on ESR 60 are not centered anymore (example link: https://blog.torproject.org/sites/default/files/styles/full_width/public/image/tor-browser_0_3.png?itok=J0gWJiMB). This does not happen in a clean Firefox 60.0.2.

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