Add support for other browsers, such as Firefox, Opera and provide instructions

* **Feature description:**
Please add support for popular browsers such as Firefox and Opera, or if such support exists, please provide instructions for installation and use.

* **Reason for the feature or improvement:**
As part of my own development process, I use various browsers for testing, and would like to be able to use browsers other than Chrome and Edge.

* **How does your idea fit with the aim/scope of the project?**
This added support will allow a more browser agnostic approach to use.

* **What are the merits of the feature?**
I believe this added support will further empower the tool's ability to analyze usability and inclusiveness by providing greater flexibility for the environments it can used in.

* **Screenshots, if you can show something similar, or a sketch:**
I was not able to install for Firefox

* **Any other information:**
Thank you for your consideration!