Refactor _WD_FrameLeave

[Danp2]

Pull request

Proposed changes

Update code to remove browser specific checks

Checklist

Put an x in the boxes that apply. If you're unsure about any of them, don't hesitate to ask. We are here to help!
This is simply a reminder of what we are going to look for before merging your code.

• [x] I have read and noticed the CODE OF CONDUCT document
• [x] I have read and noticed the CONTRIBUTING document
• [ ] I have added necessary documentation or screenshots (if appropriate)

Types of changes

Please check x the type of change your PR introduces:

• [ ] Bugfix (change which fixes an issue)
• [ ] Feature (change which adds functionality)
• [x] Code style update (formatting, renaming)
• [x] Refactoring (functional, structural)
• [ ] Documentation content changes
• [ ] Other (please describe)

What is the current behavior?

Original coding processed response differently between Chrome & Firefox

What is the new behavior?

Simplified coding by removing browser specific checks

Additional context

Add any other context about the problem here.

System under test

Please complete the following information.

• OS: [e.g. Windows 10]
• OS Arch.: [e.g. X64]
• Browser [e.g. firefox]
• Browser version [e.g. 96.0.3]