yes, I think it's probably fake, injecting js/css or intercepting requests isn't very hard and it's funny enough as a hoax to be worth the effort. I also wonder if there's something about opera that makes this easier, I haven't looked at it in a decade.
CSS:
@-moz-document url-prefix("https://x.com/") {
div.r-1wtj0ep:nth-child(2) > div:nth-child(1) > div:nth-child(2) > div:nth-child(2) > span:nth-child(1) {
color: transparent;
&::before {
color: rgb(113, 118, 123);
content: "video evidence!!!";
}
}
}
xcss.mp4
inspect element -> copy -> css selector is helpful for this in firefox