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That isn't a Firefox issue but a computer shop service to help remove such issue. And or you have to search on the internet "How to remove irevibele. com" site or link that is doing that.
What do you mean by 'remove'? Do you want to stop the website from ever loading? If so, there is this extension (which I haven't used).
https://addons.mozilla.org/firefox/addon/block-website/
You can also add the site to a content blocker or use a hosts file.
https://addons.mozilla.org/en-US/firefox/addon/ublock-origin/