Add Firefox browser support

## Feature Request

Currently, the recaptchaSolver appears to only support Chrome/Chromium-based browsers. Firefox support would greatly expand the tool's compatibility and usefulness.

### Current Behavior
The solver likely only works with Chrome/Chromium browsers.

### Requested Feature
Add support for Firefox browser to enable the recaptcha solving functionality across different browser engines.

### Benefits
- Increased browser compatibility
- Wider user base support
- Better cross-platform functionality

### Implementation Considerations
- Firefox WebDriver integration
- Browser-specific API adjustments
- Testing across Firefox versions
- Documentation updates for Firefox setup instructions

This enhancement would make the tool more accessible to users who prefer Firefox over Chrome-based browsers.