Add-on icon is not showing up

Add-ons Add-on Support
#1

I’ve just finally get this add-on updated, but now the icon in toolbar is not showing up.
https://addons.mozilla.org/ru/firefox/addon/artsembler-quicksave/

Locally everything works absolutely fine - i’ve tried to run source code with jpm run and i’ve tried to compile it with jpm xpi - everything is ok. Why the same addon installed from Mozilla-add-ons is not showing up?

This is install.rdf

<?xml version="1.0" encoding="UTF-8"?>

<RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
     xmlns:em="http://www.mozilla.org/2004/em-rdf#">
  <Description about="urn:mozilla:install-manifest">
    <em:id>id hidden</em:id>
    <em:bootstrap>true</em:bootstrap>
    <em:version>1.30</em:version>
    <em:type>2</em:type>

    <em:targetApplication>
      <Description>
        <em:id>{id hidden}</em:id>
        <em:minVersion>31.*</em:minVersion>
        <em:maxVersion>47.*</em:maxVersion>
      </Description>
    </em:targetApplication>

    <em:name>ARTSEMBLER QUICKSAVE</em:name>
    <em:description>This Add-on allows quickly save web-pages into Artsembler knowledge base.</em:description>
    <em:creator>Anton Aleksandrov</em:creator>
    <em:homepageURL>http://www.artsembler.com/</em:homepageURL>
  </Description>
</RDF>

This is part of /index.js:

var button = require("sdk/ui/button/action").ActionButton({
  id: "artsembler-quicksave",
  label: "Artsembler QuickSave",
  icon: {
    // "16": "./icon-16.png",
    // "32": "./icon-32.png",
    "64": "./icon.png"
  },
  onClick: handleClick
});

package.json:

{
  "title": "Artsembler QuickSave addon",
  "name": "browserextensions",
  "version": "0.0.1",
  "description": "A basic add-on",
  "main": "index.js",
  "author": "Anton Aleksandrov",
  "engines": {
    "firefox": ">=38.0a1",
    "fennec": ">=38.0a1"
  },
  "license": "MIT",
  "keywords": [
    "jetpack"
  ]
}

icon located in /data/icon.png