Hmmm, seems like the name Flashblock is misleading as Wikipedia lists it as a content filtering extension and it doesn't even block Flash content as the name would suggest but rather "allows users to prevent page elements, such as HTML object tag browser plug-ins and advertisements, from being displayed." AFAIK this same thing can be achieved via uBlock Origin's element picker. Much more powerful.

NoScript is in the process of being converted into a WebExtension and will be available soon.

• https://hackademix.net/2017/11/14/double-noscript/

The new webextension version of NoScript for Firefox 57+ is now out https://addons.mozilla.org/firefox/addon/noscript/

https://hackademix.net/2017/11/21/noscript-1011-quantum-powerball-finish-and-rebooting/