Unfortunately some Chromium-derived browsers (including the copy of chromium-browser shipping in Debian) are shipping with features turned on as if they were developer builds.
Chromium developer builds by default ship all experimental features, including ones that aren't ready to be shipped yet. End-user builds of Chromium-derived code need to build with fieldtrial_testing_like_official_build=true to disable these features. See this thread where this was announced in 2015 for details: https://groups.google.com/a/chromium.org/d/msg/chromium-packagers/UmdUH3AkQRE/TifdFA-OAgAJ Notably, some experimental features in M56 were incompatible with each other (one of the field trials is not shipping for M56). See https:/ /bugs.chromium.org/p/chromium/issues/detail?id=693943 A Debian packager will need to build a new copy of chromium-browser with the correct flags in order to fix this issue. -Steven