This bug was filed from the Socorro interface and is report bp-13d34b8c-e0a4-447d-9f8c-b5b670181209. ============================================================= Top 10 frames of crashing thread: 0 xul.dll ?MOZ_CrashOOL@@YAXPEBDH0@Z.llvm.7601552530652253282 mfbt/Assertions.h:314 1 xul.dll GeckoCrashOOL toolkit/xre/nsAppRunner.cpp:5124 2 xul.dll static void gkrust_shared::panic_hook toolkit/library/rust/shared/lib.rs:234 3 xul.dll static void core::ops::function::Fn::call<fn /libcore/ops/function.rs:78 4 xul.dll static void std::panicking::rust_panic_with_hook /rustc/da5f414c2c0bfe5198934493f04c676e2b23ff2e/src/libstd/panicking.rs:481 5 xul.dll static void std::panicking::continue_panic_fmt /rustc/da5f414c2c0bfe5198934493f04c676e2b23ff2e/src/libstd/panicking.rs:391 6 xul.dll static void std::panicking::rust_begin_panic /rustc/da5f414c2c0bfe5198934493f04c676e2b23ff2e/src/libstd/panicking.rs:326 7 xul.dll static void core::panicking::panic_fmt /rustc/da5f414c2c0bfe5198934493f04c676e2b23ff2e/src/libcore/panicking.rs:77 8 xul.dll static <NoType> core::result::unwrap_failed<alloc::string::String> /libcore/macros.rs:26 9 xul.dll static void webrender::platform::windows::font::FontContext::add_native_font gfx/wr/webrender/src/platform/windows/font.rs:175 =============================================================

From crash report: called `Result::unwrap()` on an `Err` value: "missing font family for descriptor FontDescriptor { family_name: \"Noto Sans\", weight: Regular, stretch: Normal, style: Normal }"