Created attachment 634688 [details] testcase (crashes Firefox when loaded) Messy testcase. I guess some state is not visible to serializeDOMAsScript :/
Aryeh, can you please take a look?
This was bug 762183 part 4. It added a while loop to change selectedNode's value, but didn't account for the fact that it might set it to null. Just need a null check here.
Created attachment 634809 [details] [diff] [review] Patch v1 https://tbpl.mozilla.org/?tree=Try&rev=dc65bbdb8a0d
On Windows: bp-591d4a60-3df4-4f94-8c9f-12fb72120620.