Examine source code of tabFx

{
  "manifest_version": 2,
  "name": "tabFx",
  "version": "1.3.2resigned1",
  "description": "Search and auto filter similar tabs in a fast way",
  "homepage_url": "https://github.com/2alin/tabFx",
  "icons": {
    "48": "icons/icon-48px.svg"
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48px.svg"
    },
    "default_title": "tabFx",
    "default_popup": "popup/main.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a689908f-85ed-4f36-8ab1-863225468205}"
    }
  }
}