One of the nicer Mozilla tricks I’ve learned is the following: in the chrome subdir of your profile - for galeon this is ~/.galeon/mozilla/galeon/chrome/ - firefox uses .firefox/default/*/chrome - you can create a file named userContent.css

You can use this to add additional CSS rules - for example the following CSS3 selector to mark links to PDF files (yes, to avoid clicking on links that will download the often big PDF files):

a[href$=”.pdf”]:after { font-size: 10px; color: red; content: “ [PDF]”; }