In DEBUG build.
09: core::panicking::panic_const::panic_const_sub_overflow::hfd95b26b6f045e4b[/usr/lib/amd64/thunderbird/libxul.so +0x2dc450f6]

Work around by avoid subtraction.

--- thunderbird-144.0.1/gfx/wr/webrender/src/profiler.rs.old	2025-10-21 15:35:53.374237784 -0400
+++ thunderbird-144.0.1/gfx/wr/webrender/src/profiler.rs	2025-10-21 15:41:00.448394832 -0400
@@ -654,7 +654,7 @@
         if update_avg {
             self.start = now;
         }
-        let one_second_ago = now - ONE_SECOND_NS;
+        let one_second_ago = now;
         self.frame_timestamps_within_last_second.retain(|t| *t > one_second_ago);
         self.frame_timestamps_within_last_second.push(now);