Bug 859526 - Null check parent frames when wrapping preserve-3d display lists. r=roc
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# High-Level APIs #
Modules in this section implement high-level APIs for
building add-ons:
* creating user interfaces
* interacting with the web
* interacting with the browser
These modules are "supported": meaning that they are relatively
stable, and that we'll avoid making incompatible changes to them
unless absolutely necessary.