How many times have you wrote a reply in a reply box on a forum and then went to post and either got some error or you've been timed out, it always tends to happen when you've wrote out a long reply too.
I realise on here that your text/form is auto saved at various points, but not all sites are like this. Also you could just use some text editor (Notepad on Windows or TextEdit on Mac) to write your reply and then copy & paste it over onto the site your replying on, but sometimes its easy to forget to do this.
Lazarus is a little add-on that runs in the background. Essentially it saves text that you are typing out, so that if the worst happens and you either get timed out of a website or when you click on post you get an error, you can simple use Lazarus and recover the text that you had already wrote out.
I have Lazarus installed on both Chrome & Firefox, but I feel it works better on Firefox due to the Lazarus icon been available at all times on the bottom right of the Firefox window, whereas on Chrome, its dependant on the little Lazarus icon been shown in the reply window of what your typing (and this doesn't show/work on all websites I find when using it on Chrome).
Lazarus for Firefox browser:
https://addons.mozilla.org/en-US/firefox/addon/lazarus-form-recovery/
Lazarus for Chrome browser:
https://chrome.google.com/webstore/detail/lazarus-form-recovery/loljledaigphbcpfhfmgopdkppkifgno?hl=...
