The configuration file format is YAML and looks like:
```
prefs:
foo.bar.boolean: true
foo.bar.string: "string"
foo.bar.int: 500
env:
MOZ_LOG: nsHttp:5
args: [--marionette]
```
By default, if the consuming App is debuggable, GeckoView will read
configuration from `/data/local/tmp/$PACKAGE-geckoview-config.yaml` at
startup.
For consumers (including browsers) that want to allow the underlying
GeckoView to be remote controlled in some way, the
`GeckoRuntimeSettings.Builder.configFilePath()` method allows to avoid
the default behaviour depending on the `android:debuggable` flag. For
example, release versions of Firefox for Android will want to allow
this configuration when appropriate App-level settings are toggled.
The additional configuration is appended after any existing configuration
methods, e.g., after anything specified using Intent argument extras
or existing `GeckoRuntimeSettings.Builder` methods.
Differential Revision: https://phabricator.services.mozilla.com/D25885
--HG--
extra : moz-landing-system : lando
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