Browser extensions are an underused category of AI tooling — they bring AI capability directly into the context you're already working in, without switching tabs or tools.
Grammarly
The original AI writing extension, still genuinely useful for catching errors and improving clarity across everything you write online.
Merlin or similar all-in-one AI extensions
Bring AI chat capability directly into any webpage — summarizing an article, answering a question about content you're already reading, without leaving the page.
AI-powered ad blockers and content filters
Some newer extensions use AI to more intelligently filter distracting or low-quality content, going beyond simple keyword-based blocking.
Reader mode + AI summarization combos
Extensions that strip a page down to readable content and offer an instant summary save real time when researching across many sources.
A word of caution
Browser extensions have broad access to what you browse — install only from reputable sources, and be mindful of what data you're comfortable an extension processing.