The problem is that modern websites use features that require a web browser of memory usage that exceeds the 256MB of RAM of the N900. Your choices here are simple:Use a modern web browser which doesn't support JavaScript (Dillo, Lynx, etc.) and accept that many websites won't work. Continue to use MicroB which has no HTML5 support, old ECMAScript support, old Flash support and accept that many websites won't work. Use a modern lightweight browser from Devuan like Midori or Surf which is more feature complete than MicroB and accept that it will run slowly on the N900. Nevertheless it is way more useable than Firefox or Chromium. Run Firefox or Chromium on a server and connect to that from your N900 via VNC. Forget about your N900 and run Maemo Leste on a device with more RAM. Don't think you are ever going to get anything better on the N900.