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There used to be a Firefox add-on called Lazarus that did this.

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.

I’ve found that this can replace Lazarus in modern Firefox:

https://addons.mozilla.org/en-US/firefox/addon/form-history-...

Thats really buggy with Firefox ESR, Mozilla are adding more WebExt APIs to make it work better though so hopefully it will work at some point.

Yeah, but it would require an enormous amount of fast disk space. An actual keylogger would probably be more useful.

> Could linux write everything to a file every 30 seconds. A bit like a keylogger

yes, but probably not a good idea?