Business Idea: How to develop a Chrome Extension using OpenAI for Detecting & Highlighting Uncommon Terms in User Agreements


Building a Chrome extension using OpenAI to check terms and conditions whenever a user signs up and to identify any uncommon terms involves the following steps:

  1. Set up your development environment:
  • Install Google Chrome
  • Install a text editor like Sublime Text or Visual Studio Code
  • Create a new folder for your project
  1. Create the manifest.json file:
  • The manifest file is a JSON file that contains information about your extension, such as the name, version, and permissions.

Here is an example:

  "manifest_version": 2,
  "name": "My Chrome Extension",
  "version": "1.0",
  "description": "A simple Chrome extension to check for uncommon terms in website T&Cs",
  "permissions": [
  "background": {
    "scripts": ["background.js"],
    "persistent": false
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Check for uncommon terms"
  "content_scripts": [
      "matches": ["<all_urls>"],
      "js": ["content.js"]

In the above example, the extension is named “My Chrome Extension,” has version 1.0, and its purpose is described in the description field. The permissions field lists the required permissions, in this case activeTab, which allows the extension to access the current tab.

The background script is defined in the background field, with the file background.js specified as the script to run. The browser_action field defines the default icon and title for the extension’s browser action. The content_scripts field lists the content scripts that run in the context of web pages, in this case content.js. The matches field specifies the URL patterns that the content script will run on, which in this case is set to <all_urls> to match all URLs.

  1. Write the JavaScript code:
  • You can write the JavaScript code to use OpenAI API to check terms and conditions whenever a user signs up.

Here is an example of how to use the OpenAI API to check terms and conditions whenever a user signs up:

// Step 1: Load the OpenAI API library
var openai = require("openai");

// Step 2: Authenticate the API with your API key
  model: "text-davinci-002",
  prompt: "Please enter your API key:",
  temperature: 0.5
}).then(function(key) {
  // Step 3: Check the terms and conditions
  function checkTermsAndConditions(terms) {
      model: "text-davinci-002",
      prompt: terms,
      max_tokens: 128,
      n: 1,
      stop: "",
      temperature: 0.5
    }).then(function(completions) {
      var output = completions[0].text;
      console.log("OpenAI says: " + output);
      // Step 4: Evaluate the output to see if there are any uncommon terms
      if (output.includes("uncommon")) {
        console.log("There may be uncommon terms in the terms and conditions.");
      } else {
        console.log("The terms and conditions appear to be standard.");
  // Step 5: Call the checkTermsAndConditions function when a user signs up
  document.getElementById("signup-button").addEventListener("click", function() {
    var terms = document.getElementById("terms-and-conditions").value;

Note: This code is just an example and will need to be adapted to the specific requirements and environment of your project.

  1. Add a content script:
  • A content script is a JavaScript file that runs in the context of a web page. You can use a content script to interact with the page and manipulate its content.

A content script is a piece of JavaScript code that runs within the context of a web page in a browser extension. It is used to interact with and manipulate the content of the web page. The content script runs alongside the HTML, CSS, and JavaScript of the web page, but has access to its own JavaScript environment, separate from the web page’s own JavaScript. This allows the content script to make changes to the web page’s content, or interact with it in some other way, without interfering with the page’s own code.

For example, a content script can add or modify elements on the page, respond to user interactions, or even inject its own styles and scripts into the page. To include a content script in your browser extension, you need to specify it in the extension’s manifest file. In the manifest file, you can specify the scripts that should be run, as well as the web pages where the content script should be executed.

Here is an example of a simple content script that adds a message to a web page:

// content_script.js

// When the document has finished loading
document.addEventListener("DOMContentLoaded", function() {
  // Add a message to the page
  var message = document.createElement("div");
  message.innerHTML = "This message was added by a content script!";

This content script can be specified in the manifest file like this:

// manifest.json

  "manifest_version": 2,
  "name": "My Extension",
  "version": "1.0",
  "content_scripts": [
      "matches": ["<all_urls>"],
      "js": ["content_script.js"]
  "permissions": ["activeTab"]

In this example, the content_scripts key in the manifest file specifies that the content script should be run on all URLs, and the js key specifies the JavaScript file that should be executed. The permissions key in the manifest file grants the extension the activeTab permission, which allows it to access the current web page.

  1. Load the extension:
  • Load the extension in Google Chrome by going to chrome://extensions and clicking the “Load unpacked” button.
  1. Test the extension:
  • You can test the extension by signing up on a website and checking if the terms and conditions are properly being checked and if there is any uncommon terms.

This is a basic overview of how to build a Chrome extension using OpenAI to check terms and conditions.

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