Can't restore extension settings from file

[ladygin-me]

Describe the issue

Click restore from file button and nothing happen after confirmation

Screenshot in which the issue can be seen

Your settings

• Safari 10 TP 20
• uBlock Origin version: 1.10.2.b0 & last 1.10.5.6 merged from gorhill/uBlock source
• MacOS version: Sierra 10.12.2

[el1t]

Problem was safari.extension.settings.clear() doesn't take a callback, so now it's called manually.