A few words about how to learn to solve this problem. The problem is in the loss of html data of the form, when the connection is interrupted or the server functionality is incompletely implemented.
Of course, in e-mail clients, this is not very relevant, for example, gmail permanently saves a draft. But there are so many other not so advanced services that the loss of 20 minutes of the filled form can lead to inappropriate actions.
Absolutely by chance, I noticed that the httpWatch program installed to IE solved this problem. If the request is lost, it is enough to enable httpWatch + refresh request. As a result, in fact, the post saved in the browser is again sent to the server, and the text from the filled fields is picked up safely by the httpWatch program.
The only trouble is that for firefox I don’t know a comparatively similar way, if anyone knows a similar plugin, write.
UPD: Great, for firefox, firebug solves the problem perfectly.