Examine source code of SlashPaste - Snippet Manager

{
  "manifest_version": 2,
  "name": "SlashPaste - Text Snippet Manager",
  "version": "0.99",
  "description": "Press the desired key in any text field to insert saved snippets. Fast text access right at your cursor.",
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@yourwindowsguide.com",
      "strict_min_version": "91.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "128": "assets/icons/icon128.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "32": "assets/icons/icon32.png",
    "64": "assets/icons/icon64.png",
    "128": "assets/icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "assets/scripts/content.js"
      ],
      "css": [
        "assets/styles/content.css"
      ],
      "all_frames": true
    }
  ],
  "background": {
    "scripts": [
      "assets/scripts/background.js"
    ],
    "persistent": false
  }
}