Complexity – Perplexity with Custom Plugins and Themes. Chrome and FF Extension (github.com)

Complexity started as a Perplexity AI browser extension but has been restructured into a broader suite of enhancements that work across multiple platforms and services, with Chrome and Firefox extensions (including Firefox on Android) available. The project packages a comprehensive set of added features and UI/UX improvements—custom themes, modular plugins, and extensive customization options—designed to make Perplexity-powered workflows more adaptable and user-friendly. It supports 22 languages and explicitly calls out a cross-platform extension directory at ./perplexity/extension/ for more information. For the AI/ML community this matters because it shifts a single-purpose extension into a modular toolkit that can accelerate experimentation, personalization, and accessibility when interacting with LLM-driven search and assistant interfaces. The modular plugin architecture and themeability let researchers and power users tailor interfaces and integrations to specific workflows without forking the base product, while multilingual and mobile (Firefox Android) support expands reach to non-English and on-the-go users. The repo’s focus on modularity also suggests easier maintenance and the potential to extend support to other services beyond Perplexity.