The final push to start using Firefox over Chrome on Android might finally be thanks to the enormous selection of add-ons (Firefox's version of extensions) coming out next month. Chrome doesn't offer native support for extensions in its mobile app. Also, better security.
Im currently using a stock S9+ snapdragon (why its still stock -_-). I do have most google stuff disabled and pretty much all my apps aside from android and webview (which fulgris relies on) are from fdroid or ffupdater. It could be the standard A10 shenaigans, but it's not something i've been hitting on webview and chrome based browsers