Examine source code of Email & Phone Linker

{
  "manifest_version": 2,
  "name": "Email & Phone Linker",
  "version": "3.2.2",
  "description": "Converts emails & phone numbers to clickable links. Click tel: links to copy. Per-page disable, delay, search-only, colour settings.",
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "96": "icons/icon96.png"
    },
    "default_popup": "popup.html",
    "default_title": "Email & Phone Linker"
  },
  "commands": {
    "toggle-conversion": {
      "suggested_key": {
        "default": "Ctrl+Shift+U"
      },
      "description": "Disable/enable conversion on current page (reloads page)"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "email-phone-linker@addon",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "strict_min_version": "60.0"
    }
  },
  "web_accessible_resources": [
    "converter.html"
  ]
}