Created attachment 8938055 [details] bug.png User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0 Build ID: 20171219100203 Steps to reproduce: I use a surface book 2. I load up a wikipedia page (https://en.wikipedia.org/wiki/Conflict-free_replicated_data_type#2P-Set_(Two-Phase_Set)) in landscape mode. The site renders fine. Then I rotate and use portrait mode and the site has duplicate content rendered. I have seen this on medium as well as a few other blog sites, but the wikipedia page seems easiest to reproduce. This is build ID: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0 ID:20171219100203 Actual results: I attached a screenshot of the duplicate content. This also appears to reproduce when I restart the browser in portrait mode directly. Expected results: Site renders normally.
Looks like this might be a regression since it doesn't appear to repro on v57.
Hello, can you try to find the regression using mozregression? https://blog.nightly.mozilla.org/2017/06/07/using-mozregression-on-windows/
Component: Untriaged → Developer Tools: Responsive Design Mode
Keywords: regression, regressionwindow-wanted
I probably won't have time to do a full bisect in the near future, but just wanted to at least file the bug since it makes Firefox unusable in portrait orientation. Hopefully it is reproducible on your end.
Curtis, were you using the Responsive Design Mode developer tool when this happened, or were you browsing in a normal tab?
Nope, just a normal browsing tab.
Okay, let's try Core :: Graphics then? I am not quite sure what is most appropriate, but hopefully they can redirect again if needed.
Component: Developer Tools: Responsive Design Mode → Graphics
Product: Firefox → Core
OS: Unspecified → Windows 10
Priority: -- → P3
Hardware: Unspecified → x86
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