User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.71 Safari/537.36 Steps to reproduce: I was creating simple add-on for Firefox using SDK. It was necessary to implement user preferences and one them is path to folder. I declared preference in package.json as follow: "name": "SearchDirectory", "title": "Search directory", "description": "Search directory", "type": "directory", "value": "" I packaged add-on and added it to Firefox from xpi file. Then I opened add-on settings page. There was an option to select relevant folder. I selected the path containing the Russian symbols - "C:\тупая русская папка". The path was selected and shown as new value of setting correctly. Then I tried to close extension settings page and open again. Now there was "C:\BC?0O @CAA:0O ?0?:0" value. I've the same result if read the value of setting from code using require('sdk/simple-prefs').prefs["SearchDirectory"] - it gives me garbage "C:\BC?0O @CAA:0O ?0?:0" value. Actual results: I'm getting garbage value of setting - "C:\BC?0O @CAA:0O ?0?:0". Expected results: Expected the correct value "C:\тупая русская папка".

Not sure why this got moved to Add-ons Manager but it is no longer relevant