Are there any Scraper (Rust) extensions or plugins available?

As of my last update in 2023, Rust does not have a direct equivalent to browser extensions or plugins like those found in web browsers. However, Rust has a rich ecosystem of libraries, often called "crates", which serve a similar purpose to extensions or plugins in other environments. These crates can be used to build web scraping tools or enhance existing applications with web scraping capabilities.

For web scraping in Rust, you might primarily rely on crates that can handle HTTP requests, parse HTML, and extract data. Some popular crates for these purposes include:

1. reqwest: An easy-to-use crate for making HTTP requests.
2. scraper: A crate for parsing HTML using CSS selectors, built on top of html5ever and selectors.
3. select: Another library for parsing HTML and extracting information from it.
4. html5ever: A high-performance browser-grade HTML parser.
5. serde: A framework for serializing and deserializing Rust data structures efficiently and generically.

Here's a small example of how you might use some of these crates to perform web scraping in Rust:

use reqwest;
use scraper::{Html, Selector};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Use `reqwest` to perform an HTTP GET request
    let res = reqwest::get("https://www.example.com").await?.text().await?;

    // Use `scraper` to parse the HTML document
    let document = Html::parse_document(&res);
    let selector = Selector::parse("h1").unwrap();

    // Iterate over elements matching the `h1` selector
    for element in document.select(&selector) {
        // Print the text of each element
        if let Some(text) = element.text().next() {
            println!("Found header: {}", text);
        }
    }

    Ok(())
}

In this example, you would need to add reqwest, scraper, and tokio to your Cargo.toml file, as they are external crates.

[dependencies]
reqwest = { version = "0.11", features = ["json"] }
scraper = "0.12"
tokio = { version = "1", features = ["full"] }

Remember that web scraping should be performed responsibly and ethically. Always check the website's robots.txt file and terms of service to ensure you are allowed to scrape it, and be mindful of the frequency and volume of your requests to avoid overloading the server.