As said [in this PR](https://github.com/EFForg/https-everywhere/pull/3488#issuecomment-165504924) it would be a good thing to check whether there are wrong characters at the end of the securecookie domain [as fixed in this PR](https://github.com/EFForg/https-everywhere/pull/3188).
As said in this PR it would be a good thing to check whether there are wrong characters at the end of the securecookie domain as fixed in this PR.