- Created patch-upgrading-guide.md with step-by-step instructions for updating patches across Firefox versions
- Covers understanding patch system, preparation, general workflow, and common reject types
- Includes historical context patch merging section (no longer applicable after Firefox 146)
- Documents testing, validation, best practices, and complete example session
- Provides troubleshooting section for common issues and API changes
- Details
Nirupam Bhowmick