Examine source code of floccus

{
  "manifest_version": 2,
  "name": "floccus bookmarks sync",
  "short_name": "floccus",
  "version": "5.9.1",
  "description": "__MSG_DescriptionExtension__",
  "icons": {
    "48": "icons/logo.png",
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "applications": {
    "gecko": {
      "id": "floccus@handmadeideas.org",
      "strict_min_version": "58.0"
    }
  },
  "default_locale": "en",
  "permissions": [
    "*://*/*",
    "alarms",
    "bookmarks",
    "storage",
    "unlimitedStorage",
    "tabs",
    "tabGroups",
    "identity"
  ],
  "optional_permissions": [
    "history"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self';",
  "options_ui": {
    "page": "dist/html/options.html",
    "browser_style": false
  },
  "browser_action": {
    "browser_style": false,
    "default_icon": {
      "48": "icons/logo.png"
    },
    "default_title": "Open Floccus options",
    "default_popup": "dist/html/options.html"
  },
  "background": {
    "page": "dist/html/background.html"
  }
}