Feature: Allow blocked in firewall app to use Internet if it is in foreground

[Revertron]

Many programs use data in background when user doesn't want them to do it. Often they send analytics and found MAC-addresses and your location. Therefore, users disable Internet for such apps.
But if the user wants to use such blocked app for a short time, he or she must enter in Adguard->Firewall->Find an app->unblock it->use for a short time->go back to Adguard and block an app again.

The idea is clear: we need to give users an ability to allow Internet connection for such apps in foreground.

Implementation: We can show on notification with text " is blocked by firewall" if user is running such app in foreground. The notification can have a button "Allow for this session" that will allow an app to use Internet for some time (and while user is using it). A simple tap on notification can open Firewall screen with application info and ability to block/unblock Internet for it.

[TPS]

If this is just for the sake of mobile data (not wifi), this app-level or system-wide background restriction can be set in the (4.x) system Settings » Wireless & Networks » Data Usage » WiFi. System-wide is set in the menu, & app-level is set via the individual apps shown below the graph. So is this issue to duplicate this for wifi?

[Revertron]

This will prevent such tasks.
https://code.google.com/p/android-developer-preview/issues/detail?id=29