But there are better solutions. Comment #35 in that thread actually provides one:
> The problem: Moving away from a form can result in data loss.
> Your solution: Make it harder to move away.
> The correct solution: Cache tab history completely and make it easy to move forward and backward in a tab's history by reusing cache and maintaining form contents.
Safari does this, for instance, and yes it does happen that I accidentally the whole thing by hitting backspace, but it's OK because I know if I just go forward again, it'll all still be there – fully intact.
> The problem: Moving away from a form can result in data loss.
> Your solution: Make it harder to move away.
> The correct solution: Cache tab history completely and make it easy to move forward and backward in a tab's history by reusing cache and maintaining form contents.
(Source: https://bugs.chromium.org/p/chromium/issues/detail?id=608016...)
Safari does this, for instance, and yes it does happen that I accidentally the whole thing by hitting backspace, but it's OK because I know if I just go forward again, it'll all still be there – fully intact.