People in the comments already have “Avoid Gecko-based browsers like Firefox as they’re currently much more vulnerable to exploitation and inherently add a huge amount of attack surface. Gecko doesn’t have a WebView implementation (GeckoView is not a WebView implementation), so it has to be used alongside the Chromium-based WebView rather than instead of Chromium, which means having the remote attack surface of two separate browser engines instead of only one. Firefox / Gecko also bypass or cripple a fair bit of the upstream and GrapheneOS hardening work for apps. Worst of all, Firefox does not have internal sandboxing on Android.”

I mean Gecko based browsers are actively recommended against on mobile. Chromium based browsers are recommended. Also I use mullvadVPN DNS based ad blocking, and I also have Brave that has built in ad blocking. Do yourself a favor and ditch adblock in favor of Ublock origin