manifest.json

{
    "manifest_version": 2,
    "name" : "PriceHelper", 
    "version" : "1.3",
    
    "options_page": "options.html",
    "description" : "Expansion shows the price of the item from the trading platform Steam.",
    "background": {
        "scripts": ["js/jquery.min.js","background.js", "lib/Dictionary.js"],
        "persistent": false
    },
    "web_accessible_resources": [
        "lib/Dictionary.js",
        "css/preloader.css"
    ],  
    "browser_action": {
        "default_title": "PriceHelper",
        "default_icon": "img/icon.png",
        "default_popup": "popup.html"
    },
    "permissions": [
        "tabs",
        "https://*/*",
        "http://*/*"
    ],
    "content_scripts": [
    {
      "matches": [ "https://market.csgo.com/*/*" ],
      "js": [ "js/jquery.min.js", "background.js", "lib/Dictionary.js" ],
      "css" : ["css/inject.css" , "css/preloader.css"],
            "html" : ["html/inject.html"],
	  "run_at": "document_end"
    }
  ]
}