This isn't necessarily a coding problem, but users here would be the perfect people to ask.
Is there an easy way to view and edit a simple text file (.txt seems the most obvious) on a browser (I use Chrome). I'd like this file to be stored locally as well, preferably in my dropbox folder so it's backed-up at all times.
I tried looking for a chrome extension that does this, but after 3 failed attempts I thought there might be a manual way to do this.
I don't care about the format as long as it's common and can be opened on other computers if need be.
HTML5 has a File API: http://www.html5rocks.com/tutorials/file/filesystem/
Once you read that you will realize that you can use a blob builder to write to a file, then post that file back to your browser which will automatically download it.