Security policies have essentially killed the user script and bookmarklet ecosystem. Most of the scripts you can find on the remaining sites like Greasy Fork only provide minor improvements.
FUCK YES. This was supposedly done for “security,” but really it was for ease of conning, snookering, and scamming the rubes. It’s all lies that these capabilities were removed to make things more secure. Well, true in a way, I guess: they were rooted out to make corporations and their scams more secure from you.
I was saddened by how even very many “smart” people bought into these obvious perfidies. Hell, the post to which I linked even buys into it even though it’s easily disproven.