Blinking text is an HTML formatting type that should never have happened. There's nothing that is so important that it should flash on and off, and luckily few people use it online.

Still, it doesn't hurt to be sure, and so it is possible to disable blinking text altogether in Firefox.

Type about:config into the address bar and press enter. Firefox 3 now displays a warning about changing these settings so click on the 'I'll be careful, I promise' button. Click in the text box labelled filter and start typing browser.blink_allowed so that the option appears. Double-click on the option to change it to false. Close the tab and never worry about blinking text again.

Thanks to Lifehacker for the tip