I type into LibreOffice. I have a separate file that has my coding that I use on a consistent basis, so it's as simple as copying and pasting the coding where it needs to go.

I used to write in the browser but I've had what Shane mentioned happen as well as accidentally closing my browser while switching tabs. I'd definitely not suggest writing in the browser. You just never know. At least if I'm in LibreOffice, if something happens and my power goes out, it gets backed up when the computer goes down. Unless it would completely crash on me, I stand very little chance of losing anything.

Plus, LibreOffice autosaves periodically if you've gone on to do something else for a few minutes.