@Mohamedalamelhode
There's no offiicial version of Vivaldi for Android TV devices, but with a little work, it certainly can be used, and works well. I've been using Vivaldi as the default browser on my TV for ages, and it works well.
You'll need to manually sideload the Vivaldi APK onto your TV. Just grab the APK from Vivaldi's website download page on your PC, then connect to your TV with adb and sideload the APK. Note: You'll probbably need the ARM version of the APK, rather than the ARM64 version.
The only real problem with running Vivaldi on the TV is navigation, as the program is designed for touch screens, and TVs generally don't have touch screens. The solution here is to use either a hardware mouse plugged into a USB port of your TV, or some kind of software mouse solution.
If you also have an Android phone or tablet, an excellent option is "Android ADB Mouse Keyboard" from Google Play (https://play.google.com/store/apps/details?id=svarzee.android.apps.adb_mouse). This allows you to access the phone's keyboard to enter website URLs, searches etc. Really good app, and totally free.
For a dedicated mouse app on the TV itself, TV Quick Actions Pro (https://play.google.com/store/apps/details?id=dev.vodik7.tvquickactions) is awesome. It's a paid app, but well worth a few bucks. Works well with Vivaldi too. It's got a ton of awesome features besides the virtual mouse (app launcher dock, on-screen clock/weather, screen dimming, button remapping etc). You can scroll web pages with the mouse, select links and so on. It can be a bit fiddly, but easy enough to get used to.