I love the minimalism.
So I don't like install many stuffs and execute many programs.
Sometimes I just need to write garbages, but I don't want to open notepad.
I found the way :)
Since I live in the browser, I just open a new tab and type in the url tab.
data:text/html, <html contenteditable>
Made a bookmark from it.
Below is upgrade version. You can use more big text :)
data:text/html, <textarea style="font-size: 2em; width: 100%; height: 100%; border: none; outline: none" autofocus />