Untrack links by Firesphere

Replace links like <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/e9e25ab1674d2dff1886aea42a86310133fc37ac8219e9cd987e06f5b434e856/https%3A//google.com/%3Fq=https%3A//example.com/article" rel="nofollow">https://google.com/?q=https://example.com/article</a> with <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/46da3a9ea35d664507f1ddb4659b1b247ad190f9b40e1f68516170f1cad02061/https%3A//example.com/article" rel="nofollow">https://example.com/article</a>, so you're not redirected through Google's tracking.