Examine source code of phrase saver

{
  "manifest_version": 2,
  "name": "Phrase",
  "version": "1.0",
  "description": "[SLUG: phrase-saver] [SHORT: Capture phrases via context menu and browse saved snippets in a popup.] [LONG: Phrase adds a context menu entry that captures selected text as a named phrase. Open the popup to browse, search, and copy saved phrases to the clipboard. Perfect for writers, researchers, and anyone who wants to save interesting passages they find while reading online.]",
  "browser_specific_settings": {
    "gecko": {
      "id": "phrase@example.addon",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "description": "Phrase collects no data. All saved phrases remain on your device in local storage."
      }
    }
  },
  "browser_action": {
    "default_popup": "clips/viewer.html",
    "default_title": "Phrase",
    "default_icon": {
      "16": "icons/phrase-capture-16.png",
      "48": "icons/phrase-capture-48.png",
      "128": "icons/phrase-capture-128.png"
    }
  },
  "background": {
    "scripts": [
      "phrases/capture.js"
    ],
    "persistent": false
  },
  "permissions": [
    "storage",
    "contextMenus",
    "clipboardWrite"
  ],
  "icons": {
    "16": "icons/phrase-capture-16.png",
    "48": "icons/phrase-capture-48.png",
    "128": "icons/phrase-capture-128.png"
  }
}