Examine source code of omni-containers

{
  "name": "omni-containers",
  "description": "To use, type 'co' part of the name of the container you want to switch to into the URL bar. This addon will switch the current container to that one.",
  "version": "0.2",
  "applications": {
    "gecko": {
      "strict_min_version": "55.0"
    }
  },
  "homepage_url": "https://git.tom.tf/omni-containers",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "omnibox": {
    "keyword": "co"
  },
  "manifest_version": 2,
  "permissions": [
    "activeTab",
    "cookies",
    "contextualIdentities"
  ]
}