Today I discovered It's All Text. This is a FireFox (also works in SeaMonkey) extension that gives you the capability of editing a box of text in your favorite editor.
I love to use SeaMonkey, but the text editor is a bit light when it comes to writing code or fix broken HTML. To palliate to this problem, I often copy and paste the content of my posts from SeaMonkey to gVim, my favorite editor, apply the fixes lightning fast, and then copy the result back in SeaMonkey before saving.
This is a rather tedious process and prone to mistakes. To avoid problems, you can instead install ...