JavaScript Userscript for Webpage Saving

I need a JavaScript Userscript that should be compatible with older browsers like Mozilla version 42. The Userscript should allow users to save and retrieve webpages using local storage, as well as provide a user interface for managing the saved pages.

Key Requirements:
- Develop a JavaScript Userscript
- Compatibility with older browsers like Mozilla 42
- Functionalities include saving and retrieving webpages
- It should save all necessary components (HTML, CSS, JavaScript, images, etc.) to ensure the page looks and functions the same when loaded from local storage.

Ideal Skills:
- Proficient in JavaScript
- Experience in developing Userscripts
- Understanding of local storage in browsers
- Familiarity with browser compatibility issues
- UI/UX design for simple user interface

Optional:
- Experience with Mozilla 42's compatibility issues
- Knowledge of browser extension development
- Previous projects involving webpage saving and retrieval
- Command-line interface development experience