Links:...

If you ever have the problem of forgetting you were writing something and closing a window, or accidentally navigating away from the page on which you are composing, this is the browser extension to save your ass: Form History Control....

Downvote everything on the page

Recently I found this developer who has published dozens of small, useful extensions for firefox. Nothing groundbreaking that I know of but everything looks to have been made with care to efficiency and minimal permissions to do one thing well. Each has its own github repo where the developer responds to issues....