Question: I need a browser extension that allows me to execute custom commands on highlighted text, like translating or summarizing it.

If you want a browser extension that lets you run custom commands on highlighted text, DashAI is a great option. This Chrome extension embeds ChatGPT functionality directly into web pages so you can run custom commands, translate text or summarize documents with a click. It also has options for audio transcription and generating AI content, and it comes with more than 100 built-in prompts. The extension requires an OpenAI API key and costs $17 for a one-time license.

Another good option is Lunabot, which works in Chrome, Edge, Firefox and Arc. It's got custom commands for translation, summarization and writing, as well as prebuilt commands and text selection shortcuts. Lunabot also can be integrated with a web app, Telegram bot and mobile apps for iOS and Android, so it's a good option if you want to get more out of your browser and other apps. Pricing starts at a free tier and rises to $19.99/month for the Super plan.

If you're into web automation, HARPA is a powerful Chrome extension that uses AI models for instant answers, summarization and content generation in a wide variety of tasks. It's got more than 100 web-aware commands and can be triggered on any website with a keyboard shortcut (Alt + A). HARPA has a free version and several subscription tiers, so it's a good option if you want to automate some tasks on the web and get more out of your browser.

Last, AI Anywhere gives you an integrated AI copilot that works on multiple apps, documents, emails and websites. You can select text and then run actions like translation, explanation and summarization with a click. The AI Anywhere Pro version adds features like GPT-4 support and custom prompts for $9.99/month. This tool is designed to get you where you want to go with a few quick keyboard shortcuts.