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Firefox ricing
This dongle is a You can edit Firefox's appearance with CSS (Cascading Style Sheets). To be more general, you can alter ANY web page with CSS. This is achieved with the usage of userstyles. To use and take complete advantage of them, you need a userstyle manager.
In Firefox's case, this would be Stylish: https://addons.mozilla.org/en-US/firefox/addon/stylish/
The Stylish button that appears after you install it is useful. For instance, to write a userstyle for Firefox, you need to go to:
chrome://browser/content/browser.xul
And select Write new style -> For this URL, and it'll have a template set up.
The most useful feature in writing userstyles is the Inspector. You pop it up by pressing Ctrl+Shift+C and it'll let you see what elements you can style on the page.
You can learn how to write CSS in:
