Defog — Auto Text & Word Replacer

Defog automatically replaces text on every webpage you visit. Map UUIDs, IDs, hashes, codes, or any text pattern to a human-readable label — and never squint at a raw identifier again. Create a mapping once, and Defog replaces every occurrence across every site you visit. Replacements survive page navigation, dynamic content updates, and single-page app re-renders. Your data never leaves your browser. All mappings are stored locally. Fully open source: https://github.com/ayoung19/defog-extension Who is it for? Developers & DevOps Replace UUIDs, API keys, commit hashes, container IDs, and database row IDs with meaningful names across dashboards, logs, and admin panels. Support & Operations Map ticket IDs, customer IDs, and order numbers to names or descriptions so you can scan queues and dashboards faster. QA & Testing Turn opaque test data and environment identifiers into readable labels while reviewing test results or staging environments. Analysts & Data Teams Replace encoded dimension values, experiment IDs, or feature flag keys with plain English on analytics dashboards. Students & Language Learners Swap vocabulary words, abbreviations, or foreign terms with translations or definitions as you read. Content & Well-being Replace distracting, triggering, or unwanted words with alternatives as you browse. Anyone Nicknames for friends, inside jokes, or just making the internet a little more fun. Key Features - Instant text replacement across all websites - Works on dynamic pages — survives React re-renders, SPA navigation, and DOM mutations - Simple popup UI — add a mapping in seconds - Global on/off toggle — pause all replacements with one click - Dark mode, light mode, and system theme support - Unlimited mappings — no caps, no paywalls - All data stored locally in your browser — nothing is sent anywhere - Fully open source Coming Soon - Replacement templates — control how replacements render (e.g. "Andy Young (ebbaf2eb…)" or just "Andy Young") - Hover tooltips — see the original text on hover without replacing it - Import & export — share mapping sets with teammates - Site-specific rules — apply mappings only on certain domains - Regex pattern matching — match patterns instead of exact strings