I created a chrome extension call GPTPromt. With it, you can define your own custom prompt and use them inside the browser. You can use it as dictionary, in depth explanation, summarize, etc...
You can get the extension here - https://chromewebstore.google.com/detail/gptprompt/opddojhilianajpdmhfmlgobcckheeeb
You can check the demo in the following video.