Why Debugger does not refresh file when I restart addon?

When I do any change in script (e.g. page script) and restart the addon which I am debugging the Addon Debugger doesn’t refreshes the file where I did the changes. To refresh the file I need to reconnect the Debugger in about:debugging#addons window. Is this normal or is it a bug? Is there some way how to refresh the file to see the changes in easier way?