NoScript or ηMatrix which is a fork of uMatrix, if you're using pale moon.
Yeah! I switched to ηMatrix year ago without any issues ;)
Pale Moon + µBlock Origin + ηMatrix = <3
For more safe browsing just use Links2.[0]
Links2 is my default browser for the first time visit unknown sites & Pale Moon is my second browser for browse the Web.
Has Firefox too, but I'm using it only for few specific sites.