Steps to reproduce: - On MacOS, use more than one display, where the displays have differing DPIs (e.g. a HiDPI laptop and a regular DPI external display) - Open Firefox and position the window such that a part of the window is on both displays, but the majority of the window is on the lower-DPI display - Open an element that is implemented by a `<panel>` element (e.g. tab hover preview, the app settings menu, downloads, etc.) Actual results: The panel appears much larger than it should. Expected results: The panel appears at the same size as if the window was positioned entirely on one display.
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Steps to reproduce: - On MacOS, use more than one display, where the displays have differing DPIs (e.g. a HiDPI laptop and a regular DPI external display) - Open Firefox and position the window such that a part of the window is on both displays - Open an element that is implemented by a `<panel>` element (e.g. tab hover preview, the app settings menu, downloads, etc.) Actual results: The panel appears much larger than it should OR much smaller than it should, depending on which display has the majority of the window. Expected results: The panel appears at the same size as if the window was positioned entirely on one display.