Examine source code of Theme Font & Size Changer

{
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "version": "62.1resigned1",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "images/icon19.png",
      "38": "images/icon38.png"
    },
    "default_title": "Theme Font & Size Changer"
  },
  "manifest_version": 2,
  "content_scripts": [
    {
      "js": [
        "scripts/content_script_st.js"
      ],
      "matches": [
        "*://*.barisderin.com/*"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "management",
    "activeTab",
    "downloads",
    "contextMenus",
    "<all_urls>",
    "http://*/*",
    "https://*/*",
    "menus",
    "theme"
  ],
  "web_accessible_resources": [
    "setup/*",
    "style/*",
    "scripts/*"
  ],
  "applications": {
    "gecko": {
      "id": "{f69e22c7-bc50-414a-9269-0f5c344cd94c}"
    }
  }
}