Screen reader plugins are small pieces of downloadable codes that enhance the capabilities of screen readers and often improve accessibility. In this paper, we aim at understanding the user experience of screen readers' plugins, why screen reader users use plugins, who develops plugins, and how plugins are distributed and maintained. To that end, we conducted a study with 14 blind screen reader users. Our study revealed that plugins are useful -from solving minor compatibility problems to enabling blind users to work effortlessly with their preferred screen readers. Among many findings, our study revealed that blind users like plugins for addressing accessibility issues, installing plugins is easy, but finding a plugin is difficult, only a handful people develop plugins, the lack of financial incentive plays in the slow growth of the plugin ecosystem, and the dire need for a central plugin store. In the end, we make some recommendations on how to make the ecosystem better. Key recommendations include creating a central repository for all plugins, engaging third-party developers, and raising general awareness about the plugins. We believe our findings will inspire accessibility researchers to embrace the plugin-based distribution model and focus on improving it.CCS Concepts: • Human-centered computing → Empirical studies in accessibility; Accessibility systems and tools.