I love modifying the look and feel of my screen, especially changing the fonts. Many applications (web sites) do not allow the user to change the fonts. They suck! Enter Stylish . It lets me trap the layout and change according to my taste. I can have different look and feel according to the address, URL, or even global. I love Stylish. Now, there are (new) applications under Google Chrome . For example, I've been using tweetdeck under Chrome. The problem is, tweetdeck does not allow me to change fonts. I want to user Stylish to change the fonts but don't know how to do it. For example, I don't know how to match the address or URL for this. I tried to use "tweetdeck" as part of URL / regex, but it doesn't work. Any hints? For now, let me play with it.