cant give individual websites permissions like js cookie etc.
Don’t you think there is a reason why none of browsers provide this feature? Do you seriously want to open a website and be greeted with 30 pop ups asking “do you want to allow javascript on api.example.com website?”. Then instantly “do you want to allow loading static images/media on api.example.com website?”. Point is - it’s not how web works.
WHICH SITE IS SAVING WHAT DATA ON MY DEVICE
Imagine in your perfect world you get a pop up saying “Firefox has detected that example.com has saved 2 cookies on your device and they consume 43 bytes of your storage space. Do you want to delete them?”. Again, even if it saves cached data (static images) - why would you care? Firefox has addons that can help you to get rid of tracking cookies.
Please learn on how internet works. There is no such thing as “website”, especially in your context. Technically, your requested features could be possible to implement, but that would break like 100℅ of websites. And what you are probably looking for is something like Postman, but for Android. 🙆