commit 829fedd90a0d8b79acb9eabc2c24be7b5a1113dd
author jgraham <james@hoppipolla.co.uk> Tue Nov 10 13:27:27 2020
committer GitHub <noreply@github.com> Tue Nov 10 13:27:27 2020
tree 0e1a704e0a3bbf1c1835fe7819f2ab7d89be60e6
parent 38a34b21c2d37edc1a933e01a0ff3f51125519fa

Pass an absolute path in to mozrunner for the xrePath (#26466)

Otherwise mozrunner complains

tools/wptrunner/wptrunner/browsers/firefox.py

diff --git a/tools/wptrunner/wptrunner/browsers/firefox.py b/tools/wptrunner/wptrunner/browsers/firefox.py
index 75cebb9..e95bc93 100644
--- a/tools/wptrunner/wptrunner/browsers/firefox.py
+++ b/tools/wptrunner/wptrunner/browsers/firefox.py
@@ -268,7 +268,7 @@
         marionette_port = get_free_port()
         profile.set_preferences({"marionette.port": marionette_port})
 
-        env = test_environment(xrePath=os.path.dirname(self.binary),
+        env = test_environment(xrePath=os.path.abspath(os.path.dirname(self.binary)),
                                debugger=self.debug_info is not None,
                                useLSan=True, log=self.logger)