Examine source code of Contain-Git

{
  "manifest_version": 2,
  "name": "Git Container",
  "version": "1.0.5",
  "description": "Git Container isolates your Git hosting service activity from the rest of your web activity in order to prevent these services from tracking you via third party cookies.",
  "icons": {
    "48": "icon.png",
    "96": "icon@2x.png"
  },
  "applications": {
    "gecko": {
      "id": "@contain-git",
      "strict_min_version": "57.0"
    }
  },
  "homepage_url": "https://github.com/SleepingPanda/contain-git",
  "permissions": [
    "<all_urls>",
    "contextualIdentities",
    "cookies",
    "management",
    "tabs",
    "webRequestBlocking",
    "webRequest"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}