{
  "id": "u2f4moz@prefiks.org",
  "title": "U2F Support Addon",
  "name": "u2f",
  "version": "0.0.20",
  "description": "Extension adding support for U2F specification",
  "main": "index.js",
  "author": "Paweł Chmielowski",
  "contributors": [
    "Baptiste Mille-Mathias",
    "Matt N"
  ],
  "permissions": {
    "private-browsing": true
  },
  "engines": {
    "firefox": ">=38.0a1"
  },
  "license": "LGPL",
  "keywords": [
    "jetpack",
    "u2f",
    "authentication",
    "two-factor",
    "yubikey",
    "fido"
  ]
}

{
  "id": "u2f4moz@prefiks.org",
  "title": "U2F Support Addon",
  "name": "u2f",
  "version": "0.0.20",
  "description": "Extension adding support for U2F specification",
  "main": "index.js",
  "author": "Paweł Chmielowski",
  "contributors": [
    "Baptiste Mille-Mathias",
    "Matt N"
  ],
  "permissions": {
    "private-browsing": true,
    "multiprocess": true
  },
  "engines": {
    "firefox": ">=38.0a1"
  },
  "license": "LGPL",
  "keywords": [
    "jetpack",
    "u2f",
    "authentication",
    "two-factor",
    "yubikey",
    "fido"
  ]
}

Mark extension as multiprocess in pacakge.json
Mark extension as multiprocess in pacakge.json
