{
  "manifest_version": 2,
  "name": "JobFill",
  "version": "1",
  "description": "Extension will autopopulate job applications",
  "content_scripts": [{
    "js": ["./js/jquery-3.2.1.min.js", "js/content.js"],
    "matches": ["<all_urls>","http://*/*","https://*/*"],
    "run_at": "document_end"
  }],
  "browser_action": {
   "default_popup": "popup.html"
  },
  "permissions": [
     "storage",
    "<all_urls>"
   ]
}

{
  "manifest_version": 2,
  "name": "JobFill",
  "version": "1",
  "description": "Extension will autopopulate job applications",
  "content_scripts": [{
    "js": ["./js/jquery-3.2.1.min.js", "js/content.js"],
    // "matches": ["<all_urls>","http://*/*","https://*/*"],
    "run_at": "document_end"
  }],
  "browser_action": {
   "default_popup": "popup.html"
  },
  "permissions": [
     "storage",
    "<all_urls>"
   ]
}

Comment out matches key under content_scripts
Comment out matches key under content_scripts
