NordVPN

Overview Modern browser extensions often use aggressive monetization tactics that undermine the very creators they sponsor. Honey notoriously overrides existing affiliate cookies, redirecting commissions from independent creators to itself. This guide explores the architecture of **Kale**, an ethical alternative designed to prioritize creator income while still providing consumer value through automated coupon application. Prerequisites To follow this implementation, you should understand: * **JavaScript (ES6+)**: For extension logic and DOM manipulation. * **Browser APIs**: Specifically `chrome.runtime` and `chrome.cookies`. * **Python**: For backend scraping and API management. * **Web Architecture**: Understanding how cookies and HTTP redirects function. Key Libraries & Tools * **Chrome Extension API**: The core framework for browser interaction. * **Beautiful Soup**: A Python library for scraping coupons from external sites. * **Cloud Functions**: Serverless components to handle periodic data scraping. Code Walkthrough The Manifest Foundation The `manifest.json` file defines the extension's boundaries. You must explicitly request permissions to interact with sensitive user data. ```json { "manifest_version": 3, "permissions": ["storage", "tabs", "cookies", "activeTab"], "host_permissions": ["https://*/*"] } ``` Protecting Creator Commissions The core of the "not-evil" philosophy is the `isAffiliated` function. It checks for existing cookies before the extension attempts to inject its own, preventing commission theft. ```javascript async function isAffiliated(domain, cookieName) { const cookies = await chrome.cookies.getAll({ domain }); const found = cookies.filter(c => c.name === cookieName); return found.length > 0; } ``` Backend Automation For the backend, we use Beautiful Soup to gather current discount codes. This ensures the extension database remains fresh without manual entry. ```python import requests from bs4 import BeautifulSoup def scrape_coupons(url): res = requests.get(url) soup = BeautifulSoup(res.text, 'html.parser') # Logic to extract code strings return [tag.text for tag in soup.find_all(class_='coupon-code')] ``` Syntax Notes Browser extensions rely heavily on **asynchronous patterns**. Use `async/await` when calling `chrome.cookies` or `chrome.tabs` to avoid blocking the main UI thread. In the Python scraping logic, CSS selectors provide the most reliable way to target specific coupon containers on diverse e-commerce layouts. Practical Examples If a user visits NordVPN, Kale scans for an existing affiliate cookie. If absent, the extension displays a popup offering two choices: apply a coupon to support the Kale developers or apply one that randomly credits a creator like MrBeast or PewDiePie. Tips & Gotchas * **Cross-Browser Compatibility**: Chrome and Firefox use different API namespaces (`chrome` vs `browser`). Use a polyfill to maintain a single codebase. * **DOM Injection**: Websites frequently change their checkout page IDs. Implement robust error handling in `content.js` to ensure the popup doesn't break the user's checkout flow.