Thread:Extension talk:Survey/Survey appear once per user/reply (4)

But the cookie is not set on submitting the survey. It is already set when the survey is loaded. So you can easily circumvent filling out the survey by just clicking (x) or by refreshing the page and the survey neaver appears again, unless you purge your cookies. This behaviour doesn't make a lot of sense to me. Setting the cookie after submission would be a lot more useful.