What are the best Firefox extensions?

What are the best Firefox extensions?

Maybe they're not extensions.

"Control animations with about:config" [1]

If you've never used about:config, you're missing out. Type about:config into your Firefox address bar and hit Enter. One easy configuration change is limiting animated images. Double-click image.animation_mode and change it to none to stop all animated images, or once to let them run through once. You can revert to the default behavior with normal."

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