What does it mean to select 'request to activate' for Add-ons?

What does it mean to select 'request to activate' for Add-ons?
It makes it safer, for example when using flash player?
Or, when this option would be desirable?
And I read this advice: "uninstall all versions of Java completely and see if you can manage without it. Otherwise, you can always install the latest version, when you need it. »
So I was wondering - uninstall it would be safer just to assign to, "ask to activate" and (I guess?) that he ask me any time, she wants to exploit (and therefore to put my system in peril?)?
Thanks for the tips!

Request to activate is whenever Firefox ask your permission to run this plugin to make it safer.

Always activate = a time what you choose this option, the plugin works automatically whenever it needs

Never activate the plugin = never executed, until you change the option to "Ask to activate or always»

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Tags: Firefox

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