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diff -up firefox-87.0/widget/GfxInfoX11.cpp.firefox-kde-webrender firefox-87.0/widget/GfxInfoX11.cpp
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--- firefox-87.0/widget/GfxInfoX11.cpp.firefox-kde-webrender	2021-03-22 19:55:59.169952960 +0100
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+++ firefox-87.0/widget/GfxInfoX11.cpp	2021-03-22 20:04:35.332183657 +0100
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@@ -738,6 +738,14 @@ const nsTArray<GfxDriverInfo>& GfxInfo::
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         DRIVER_GREATER_THAN_OR_EQUAL, V(17, 0, 0, 0),
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         "FEATURE_ROLLOUT_INTEL_GNOME_WAYLAND_MESA", "Mesa 17.0.0.0");
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+    APPEND_TO_DRIVER_BLOCKLIST_EXT(
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+        OperatingSystem::Linux, ScreenSizeStatus::All, BatteryStatus::All,
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+        DesktopEnvironment::KDE, WindowProtocol::Wayland,
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+        DriverVendor::MesaAll, DeviceFamily::IntelRolloutWebRender,
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+        nsIGfxInfo::FEATURE_WEBRENDER, nsIGfxInfo::FEATURE_ALLOW_ALWAYS,
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+        DRIVER_GREATER_THAN_OR_EQUAL, V(17, 0, 0, 0),
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+        "FEATURE_ROLLOUT_INTEL_GNOME_WAYLAND_MESA", "Mesa 17.0.0.0");
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+
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     // ATI Mesa baseline, chosen arbitrarily.
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     APPEND_TO_DRIVER_BLOCKLIST_EXT(
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         OperatingSystem::Linux, ScreenSizeStatus::All, BatteryStatus::All,
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@@ -754,6 +762,14 @@ const nsTArray<GfxDriverInfo>& GfxInfo::
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         DRIVER_GREATER_THAN_OR_EQUAL, V(17, 0, 0, 0),
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         "FEATURE_ROLLOUT_ATI_GNOME_WAYLAND_MESA", "Mesa 17.0.0.0");
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+    APPEND_TO_DRIVER_BLOCKLIST_EXT(
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+        OperatingSystem::Linux, ScreenSizeStatus::All, BatteryStatus::All,
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+        DesktopEnvironment::KDE, WindowProtocol::Wayland,
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+        DriverVendor::MesaAll, DeviceFamily::AtiRolloutWebRender,
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+        nsIGfxInfo::FEATURE_WEBRENDER, nsIGfxInfo::FEATURE_ALLOW_ALWAYS,
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+        DRIVER_GREATER_THAN_OR_EQUAL, V(17, 0, 0, 0),
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+       "FEATURE_ROLLOUT_ATI_GNOME_WAYLAND_MESA", "Mesa 17.0.0.0");
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+
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 #ifdef EARLY_BETA_OR_EARLIER
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     // Intel Mesa baseline, chosen arbitrarily.
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     APPEND_TO_DRIVER_BLOCKLIST_EXT(