The GitHub PR Merge Strategy Restrictor is a Chrome extension designed to enhance control over pull request (PR) merge strategies within GitHub. It addresses a common limitation by allowing users to define specific rules for merging based on both source and destination branches, as well as repositories. This flexibility is crucial for minimizing errors during the merging process, especially in complex workflows where adhering to specific strategies is necessary.

Users can create custom restriction rules using exact branch names, wildcards, or patterns. This allows for a tailored approach to managing merges, such as applying rules to all branches or specific repositories. For example, users can set rules for all branches starting with 'feature/' or apply restrictions to all repositories under a certain naming convention. The extension aims to streamline the merging process, ensuring that users do not inadvertently select the wrong strategy.