Drawing from my 5+ years of extensive experience in Browser Extension Development, I am confident to say I am a perfect fit for your project. As you mentioned, familiarity with Chrome, Firefox, and Edge is paramount. Well, not only am I well-versed with these platforms but my previous projects have consistently leveraged cross-platform versatility at their core. This means your multi-platform proxy switcher will be supported cohesively on Windows, Mac, and Linux - ensuring your audience a hassle-free experience rich of features.
On the topic of features, let's discuss Proxy Switching - it's almost my bread and butter! I have designed numerous proxy switchers in the past, ranging from adding a simple interface to a VPN based system to developing sophisticated extensions for complex organizations. This expertise will allow me to create an extension that seamlessly integrates various proxies with options that are both user-friendly and reliable.
Furthermore, my proficiency in C++, JavaScript, PHP and Python will enable me to develop a robust architecture ensuring your extension stands up to the heavy usage expected from managing multiple browsers simultaneously. In addition, my skills in data analysis can work to your advantage when considering security measures. Together we can implement strategies that protect your users' data while using proxies.