Adding mozilla libraries required by Firefox interop test.

third_party/mozrunner/README.md

Index: third_party/mozrunner/README.md
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+[mozrunner](https://github.com/mozilla/mozbase/tree/master/mozrunner)
+is a [python package](http://pypi.python.org/pypi/mozrunner)
+which handles running of Mozilla applications.
+mozrunner utilizes [mozprofile](https://github.com/mozilla/mozbase/tree/master/mozprofile)
+for managing application profiles
+and [mozprocess](https://github.com/mozilla/mozbase/tree/master/mozprocess) for robust process control.
+
+mozrunner may be used from the command line or programmatically as an API.
+
+
+# Command Line Usage
+
+The `mozrunner` command will launch the application (specified by
+`--app`) from a binary specified with `-b` or as located on the `PATH`.
+
+mozrunner takes the command line options from 
+[mozprofile](https://github.com/mozilla/mozbase/tree/master/mozprofile) for constructing the profile to be used by 
+the application.
+
+Run `mozrunner --help` for detailed information on the command line
+program.
+
+
+# API Usage
+
+mozrunner features a base class, 
+[mozrunner.runner.Runner](https://github.com/mozilla/mozbase/blob/master/mozrunner/mozrunner/runner.py) 
+which is an integration layer API for interfacing with Mozilla applications.
+
+mozrunner also exposes two application specific classes,
+`FirefoxRunner` and `ThunderbirdRunner` which record the binary names
+necessary for the `Runner` class to find them on the system.
+
+Example API usage:
+
+    from mozrunner import FirefoxRunner
+	
+    # start Firefox on a new profile
+    runner = FirefoxRunner()
+    runner.start()
+
+See also a comparable implementation for [selenium](http://seleniumhq.org/): 
+http://code.google.com/p/selenium/source/browse/trunk/py/selenium/webdriver/firefox/firefox_binary.py