[py] Legacy Firefox driver: ensuring copy of profile dir, its 'extensions' subdir and 'user.js' file are writable. Fixes #1466

Author: barancev

py/selenium/webdriver/firefox/firefox_profile.py

@@ -77,9 +77,12 @@ def __init__(self, profile_directory=None):
             shutil.copytree(self.profile_dir, newprof,
                             ignore=shutil.ignore_patterns("parent.lock", "lock", ".parentlock"))
             self.profile_dir = newprof
+            os.chmod(self.profile_dir, 0o755)
             self._read_existing_userjs(os.path.join(self.profile_dir, "user.js"))
         self.extensionsDir = os.path.join(self.profile_dir, "extensions")
+        os.chmod(self.extensionsDir, 0o755)
         self.userPrefs = os.path.join(self.profile_dir, "user.js")
+        os.chmod(self.userPrefs, 0o644)
 
     # Public Methods
     def set_preference(self, key, value):