Examine source code of GitLab adjunct

{
  "manifest_version": 3,
  "name": "GitLab adjunct",
  "description": "The adjunct you dream about when working with GitLab",
  "version": "3.0.0",
  "author": "Florent Tassy",
  "homepage_url": "https://gitlab.com/florent_tassy/gitlab-adjunct",
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "gitlab-adjunct@ftassy",
      "strict_min_version": "109.0"
    }
  },
  "action": {
    "default_popup": "index.html",
    "default_title": "GitLab adjunct",
    "default_icon": "icon-dark.svg",
    "theme_icons": [
      {
        "light": "icon-light.svg",
        "dark": "icon-dark.svg",
        "size": 16
      },
      {
        "light": "icon-light.svg",
        "dark": "icon-dark.svg",
        "size": 32
      }
    ]
  },
  "icons": {
    "16": "icon-dark.svg",
    "32": "icon-dark.svg"
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "optional_permissions": [
    "*://*/*"
  ],
  "background": {
    "page": "background.html"
  }
}