"Response is undefined"

[htgoebel]

I tried installing the add-on via "about:debugging". The icon in the adress-bar appeared, but clicking on it has no effect. The tool-tip for the Icon says "Lazarus: Form Recovery loading ..."

The webdeveloper's debug console shows this error:

	Lazarus.callBackground/< moz-extension://.../js/platform-chrome.js:137:1
	apply self-hosted:4357:5
	applySafeWithoutClone resource://gre/modules/ExtensionCommon.jsm:304:16
	wrapPromise/</< resource://gre/modules/ExtensionCommon.jsm:517:15
	withLastError resource://gre/modules/ExtensionCommon.jsm:441:14
	wrapPromise/<

Using Firefox 60 ESR