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If you use Firefox but you dislike animated elements on web pages when you’re reading (like ads – increasingly served from Google AdSense, too), here’s what you can do:

• Use the Flashblock extension (provided you have Flash installed in the first place). This will put a placeholder over any Flash, allowing you to click it before the Flash shows. (To specifically allow a website to show Flash you can open the Tools ==> Add-ons ==> Flashblock options dialog and enter e.g. “www.youtube.com”.)
• Disable animated GIFs. To do so, type about:config into the Firefox address bar. Look for the entry “image.animation_mode”, double-click it and set its value to “none” (no quotes).

Source:→ Googleblogoscoped

Firefox, Animation, Tips and Tricks