Matomo Pull Request #15225 - Fix test cookie may be set multiple times

@tsteur opened this Pull Request on December 2nd 2019 Member

Make sure to not set a test cookie per site but instead use one test cookie overall
Only set test cookie on IE or browsers that support modal dialog
Delete the test cookie after it has been set https://github.com/matomo-org/matomo/issues/15161#issuecomment-560543852

Fix test cookie may be set multiple times #15225