Best Practices for Secure Extension Development

The text provides guidelines for building a secure extension, emphasizing the importance of avoiding the injection of remote scripts and ensuring the safe insertion of remote content. It also advises against directly injecting Google Analytics JavaScript code and recommends using XHR for Google Analytics. Additionally, it highlights the use of the standard extension content security policy, caution when sharing objects with in-page JavaScript, and the careful use of window.eval() in content scripts. The text also stresses the creation of UI with extension components, the addition of eslint-plugin-no-unsanitized to ESLint, and the avoidance of directly injecting moz-extension paths. Furthermore, it underscores the need to keep third-party libraries up to date and warns against modifying them to prevent the hiding of malicious code.