--- a/mozharness/mozilla/testing/firefox_ui_tests.py
+++ b/mozharness/mozilla/testing/firefox_ui_tests.py
@@ -13,58 +13,46 @@ import sys
 import os
 
 from mozharness.base.python import (
     PreScriptAction,
     VirtualenvMixin,
     virtualenv_config_options,
 )
 from mozharness.mozilla.vcstools import VCSToolsScript
-from mozharness.mozilla.purge import PurgeMixin
 
 
-class FirefoxUITests(VCSToolsScript, VirtualenvMixin, PurgeMixin):
+class FirefoxUITests(VCSToolsScript, VirtualenvMixin):
     config_options = [
         [['--firefox-ui-repo'], {
             'dest': 'firefox_ui_repo',
             'default': 'https://github.com/mozilla/firefox-ui-tests.git',
             'help': 'which firefox_ui_tests repo to use',
         }],
         [['--firefox-ui-branch'], {
             'dest': 'firefox_ui_branch',
             'help': 'which branch to use for firefox_ui_tests',
         }],
     ] + copy.deepcopy(virtualenv_config_options)
 
-    def __init__(self,
-                 config={},
-                 config_options=[],
-                 all_actions=[],
-                 **kwargs):
-        default_config = {
-            'purge_minsize': 2,
-        }
-        default_config.update(config)
 
+    def __init__(self, config_options=[], all_actions=[], **kwargs):
         self.config_options += config_options
 
         if all_actions is None:
             # Default actions
             all_actions = [
-                'purge-builds',
                 'clobber',
                 'checkout',
                 'create-virtualenv',
                 'run-tests',
             ]
 
         super(FirefoxUITests, self).__init__(
             config_options=self.config_options,
-            require_config_file=True,
-            config=default_config,
             all_actions=all_actions,
             **kwargs
         )
 
         self.firefox_ui_repo = self.config['firefox_ui_repo']
         self.firefox_ui_branch = self.config.get('firefox_ui_branch')
 
         if not self.firefox_ui_branch:

--- a/scripts/firefox_ui_updates.py
+++ b/scripts/firefox_ui_updates.py
@@ -98,17 +98,16 @@ class FirefoxUIUpdates(FirefoxUITests):
                 'dest': 'installer_path',
                 'help': 'Point to an installer to test against.',
             }],
         ] + copy.deepcopy(self.harness_extra_args)
 
         super(FirefoxUIUpdates, self).__init__(
             config_options=config_options,
             all_actions=[
-                'purge-builds',
                 'clobber',
                 'checkout',
                 'create-virtualenv',
                 'determine-testing-configuration',
                 'run-tests',
             ],
             append_env_variables_from_configs=True,
         )