Examine source code of BSS - Better SS.com

{
  "name": "BSS - Better SS.com & SS.lv",
  "version": "1.5.2",
  "description": "SS.com & SS.lv enhancements",
  "icons": {
    "16": "assets/icons/bss16.png",
    "48": "assets/icons/bss48.png",
    "128": "assets/icons/bss128.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://*.ss.com/*",
    "https://*.ss.lv/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.ss.com/*",
        "https://*.ss.lv/*"
      ],
      "run_at": "document_start",
      "js": [
        "bss.js"
      ],
      "css": [
        "bss.css"
      ]
    }
  ],
  "background": {
    "persistent": true,
    "scripts": [
      "style-blocker.js"
    ]
  },
  "web_accessible_resources": [
    "assets/fonts/bss.ttf",
    "assets/fonts/bss.woff",
    "assets/fonts/Roboto-Light.ttf",
    "assets/fonts/Roboto-Medium.ttf",
    "assets/fonts/Roboto-Regular.ttf"
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{4015ef04-67e5-4166-8221-f2c731101288}"
    }
  }
}