This changeset adds basic remote connection functionality to about:debugging.
About:debugging can target a remote firefox instance if the host and port
parameters are passed as URL search params.
The feature is not explicitly exposed at the moment and there is no UI to
connect an instance, and no UI feedback when connected to a remote instance.
When connected, about:debugging should correctly list tabs, workers and addons
for the target instance of Firefox. Debugging features work for all supported
targets.
Known limitations:
- preferences are read from the local Firefox instance (multiprocess, addon
debugging etc...). At the moment the remote instance must be manually
correctly configured
MozReview-Commit-ID: DOekSCb96XC
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extra : rebase_source : 89b73e885e50bfba4e1888f8791f637a5ba05ca7
extra : intermediate-source : 840e23f2a496e2cec280643fef127095bd67d518
extra : source : 6cc5cc4494e67ae9dd7371420710c3f8afe5b256
