Longer version:
Crash annotations have been historically recorded in C++ using the CrashReporter::AnnotateCrashReport() method. This would serialize the annotation value into a string and then store it in a table that would later be attached to a crash. A new way of recording crash annotations is now available via CrashReporter::RegisterAnnotation<TypeName>(). This method takes an address to the variable holding the annotation's value (which can be a boolean, integer, string, etc...) and records it among the annotations. At crash time we'll extract the values of the annotations from these addresses and serialize them into the crash report. This means that in the meantime you can update the value of the annotation at will without having to re-record it every time. The last value in memory will be picked up automatically if we crash.
One advantage of this system is that you can now pick a variable that is updated very frequently, even thousands of times per second, and still be able to record it in a crash with no performance impact. You only have to ensure that the memory holding the value is alive when we crash, even though if it isn't the annotation will just be ignored.
You can still record annotations the old way by using CrashReporter::RecordAnnotation<TypeName>(). This will make a copy of the value you passed in and keep it around with the other annotations.
You can find more details in bug 1831092 [1]. Gabriele[1] Record all annotations using the new pull-based system and remove the annotation table
https://bugzilla.mozilla.org/show_bug.cgi?id=1831092
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