Description of problem: After logging in to our company slack it stays for very long time on Loading... page and then it loads the interface only partially and is generally unusable (it does not react to clicks). Version-Release number of selected component (if applicable): Name : epiphany Epoch : 1 Version : 3.17.91 Release : 2.fc23 Architecture: x86_64 Additional info: Slack used to work without problems in epiphany in F22.