I don't want Flash, how do I make IE stop asking about installing it?

I don't have Flash installed, so on many web pages I get a dialogue which says something like "this website wants to install the following add-on: Adobe Flash Player".

Can I set this dialogue to never appear? I don't want Flash but I don't want to have to tell that to IE every single time. Can I make it remember that I don't want it?

You can disable this prompt, but that will cause all add-ons to be disabled.

1. Open Group Policy Editor: Press [Windows] + [R], enter gpedit.msc and click OK.
2. On the left, navigate to Computer Configuration, Administrative Templates, Windows Components, Internet Explorer, Internet Control Panel, Advanced features.
3. On the right, double-click on Allow third-party browser extensions.
4. Select Disabled, and confirm with OK.
5. Restart Internet Explorer and try to visit the page that was previously prompting you to install Flash Player.