Examine source code of Buildkite Pls

{
  "manifest_version": 2,
  "name": "Buildkite Pls",
  "version": "1.0",
  "permissions": [
    "activeTab"
  ],
  "description": "Allows you to filter Buildkite dropdowns.",
  "icons": {
    "48": "icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.buildkite.com/*"
      ],
      "js": [
        "buildkite-pls.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Filter Options"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{46bd361e-cf41-4a52-a2e7-c0bb5e197849}"
    }
  }
}