Firefox will set around 3 seconds delay when you try to install any addons/plugin. It is to ensure users have enough time to read the information before install any addons. But this feature cause some users feel annoying.

So, we are going to remove this feature through about:config.

1. Type about:config in your address bar.
2. Type security.dialog_enable_delay in the filter text box.
3. Change the value to 0.
4. Restart Firefox.

You can now install any addons without waiting.

Source: Daily Gyan

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