Chromium already puts heroic effort into maintaining form state. Note that, a lot of the time, it works great. For example, here on HN, if you enter half a comm

Chromium already puts heroic effort into maintaining form state. Note that, a lot of the time, it works great. For example, here on HN, if you enter half a comment, go back, and then forward, your comment will be preserved. But it is hard. No browser has succeeded in serializing full tab state: dom, forms, js, pending requests, etc. Chromium has been working on it and has large pieces of it but it is very very hard to get even close to fully correct. You're letting perfect be the enemy of better.