manifest.json

{
    "manifest_version": 2,
    "name": "Dam koto?",
    "description": "This extension adds a price tag in native currency selected beside the current price tags of amazon's price tags.",
    "version": "3.1.2",
    "permissions": ["tabs", "activeTab", "storage"],
    "browser_action": {
      "default_icon": {
        "19": "images/main_icon_19.png",
        "38": "images/main_icon_38.png"
      },
      "default_popup":"main_panel.html"
    },
    "background": {
        "scripts": ["background.js"]
    },
    "icons": { "16":  "images/main_icon_16.png",
               "48":  "images/main_icon_48.png",
               "128": "images/main_icon_128.png" },
    "content_scripts": [
    {
        "run_at" :"document_end",
        "matches": ["https://www.amazon.com/*", "https://www.amazon.co.uk/*","https://www.amazon.ca/*", "https://www.aliexpress.com/*", "https://www.alibaba.com/*"],
        "js": ["jquery-3.1.0.min.js","content.js"]
    } ],
     "web_accessible_resources":[
       "flags/*.png",
       "css/*.css",
       "fonts/*.woff2",
       "images/*.png"
     ]
}