I usually try to avoid commenting on grammar or spelling too much, but it seems like you're a non-native speaker of English, and it's a bit tricky to understand some of what you're intending.
Here's some suggestions that might make the site's purpose a bit clearer (just suggestions!)
On the main page:
"Easily find out if the web page you're reading has been discussed on Hacker News, with no API calls"
"Automatically find HN discussions when web-browsing, securely"
"Borrow HN community intelligence on every page".
"For details about how to use the bloom filter file, check here"
"I found an issue"
I'm not sure what you mean by "I want to format the url", so I'm not sure what to suggest there.
If you like, I can follow up or file an issue, with suggested rewrites for /faq. There's a lot more there than can fit in a single post.
Otherwise, seems very nice!