Created attachment 8886825 [details] Screenshot of problem If Firefox/Thunderbird is build on 10.13 using the 10.13 SDK, the top of the toolbar of standalone windows will look darker. As can be seen in the screenshots.
Does this also happen when building with the 10.11 SDK?
No, it only happens if building with the 10.13 SDK.
Per comment 2, this shouldn't block our highsierra meta bug since we're not going to start building with the 10.13 SDK anytime soon.
No longer blocks: 1379811
I took a look at your screenshot and I'm not sure what I'm looking at. Is this meant to compare the light and the dark toolbar? They look pretty identical to me. Also, have you tried building with the 10.11 SDK on macOS 10.13 (comment 1)? I'm asking because I just gave it a shot and ran into compile errors that prevented me from building successfully.
It does not compare, it is just a screenshot of the Page info window and the Library window after building with the 10.13 SDK. I have tried to build with all SDKs, from 10.9 to 10.13 on macOS 10.13. But since two weeks I have some problems to build using the 10.13 SDK, don't know why, need to sort that out.
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