Developed a firefox plug-in does not contain a valid install manifest could not install

developed a firefox plug-in does not contain a valid install manifest, that can be debugged without error messages, but cannot be installed.

{
"manifest_version": 2,
"name": "HackBox",
"version": "1.0",
" author ":" ic3s ",
" description ":" A simple hacktool"s box ",

"icons": {

"48":"icons/icons.jpg"

},
"browser_action": {

"default_title":"HackBox",
"default_icon":"icons/icons.jpg",
"default_popup":"popup.html"

},
"background": {

"scripts": [
  "jquery-3.3.1.js",
  "SpoofIP.js"
]

},
"content_scripts": [

{
  "matches": ["<all_urls>"],
  "js": [
    "jquery-3.3.1.js"
  ]
}

],
"permissions": [

"storage",
"cookies",
"tabs",
"activeTab",
"webRequest",
"webRequestBlocking",
"<all_urls>"

]
}

looked at the manifest, of several other people"s plug-ins and compared them carefully. No problem was found in the format.
the plug-in does not have a signature, but it is set to not sign in about:config. Prompt during installation

I don"t know what went wrong. I"d like to give you some advice