There used to be a Firefox add-on called Lazarus that did this. https://www.pcworld.com/article/227948/Firefox.html https://www.pcworld.com/article/227948/Fire

There used to be a Firefox add-on called Lazarus that did this. https://www.pcworld.com/article/227948/Firefox.html https://www.pcworld.com/article/227948/Firefox.html From Tom's Hardware: "Lazarus: Form Recovery is a free downloadable Add-On for the Firefox web browser that automatically saves everything you type into forms of web pages you visit. With Lazarus: Form Recovery, you will never lose what you write after a crash the browser or other technical problems. In the case when a problem, simply right click and select "recover form" to retrieve data previously typed." However, that was for web forms, not an email client or other applications.