Legacy Firefox XPI Add-on Developer -- 2

I'm looking for an experienced developer to create an XPI add-on compatible with older versions of Firefox. The add-on should continuously monitor the status of POST requests and dynamically trigger specific functions based on the response status. If you have experience with legacy Firefox extensions and JavaScript, this project is a great opportunity to showcase your skills. The ideal candidate should have a strong understanding of web request monitoring and the ability to implement custom functionality efficiently.

Key Requirements:
- Development of an XPI add-on for Firefox 42
- Functionality to monitor continuous POST requests
- Capability to inject and manipulate web pages
- Focus on specific websites

Ideal Skills:
- Extensive experience with Firefox browser and XPI add-on development
- Proficient in JavaScript, XUL, and other relevant coding languages
- Previous work with POST request monitoring
- Understanding of web page manipulation techniques
- Ability to deliver a functional add-on for a legacy system