Is it possible to handle messages in two scripts?

Add-ons Development
#1

Is it possible to handle messages from background in two or more scripts injected in one web-page?

I add
chrome.runtime.onMessage.addListener
to more scripts.

I have more commands. Using ctrl+shift+N for inspector and ctrl+shif+E for extractor. Both have different scripts. So when I hit hotkey I send message which should be proccessed in the script. But because I have more features, so I have more scripts like this. Is it possible that if I capture the message in one script it will not go to the second script? Maybe the script which is connected later overwrites the already loaded listener?

How to solve this? I think like the features are affected each other so no one works correctly.

Should I add named functions instead anonymous?

One more question:
Do all features (content scripts) share same scope or they have different scope each?

The inspector and extractor have similar namespace:
var mynamespace = {
isHidden: false,
isAppend: false,
elements: { length: 0, collection:[] },
inspector: { data: {}},
tabOpened: false,
tabID: null,
def_obj: { zindex: null, size: null, font: null, weight: null, stylesheet: null, styles: null}
};

var mynamespace = {
  elements: { length: 0, collection:[] },
  inspector: { data: {}},
  tabOpened: false,
  tabID: null,
  def_obj: { zindex: null, size: null, font: null, weight: null, stylesheet: null, styles: null}  
};

So are they overwritten and in a conflict?

Do I need to retype them like that?

var mynamespace.inspector = {
  isHidden: false,
  isAppend: false,
  elements: { length: 0, collection:[] },
  inspector: { data: {}},
  tabOpened: false,
  tabID: null,
  def_obj: { zindex: null, size: null, font: null, weight: null, stylesheet: null, styles: null}  
};

var mynamespace.extractor = {
  elements: { length: 0, collection:[] },
  inspector: { data: {}},
  tabOpened: false,
  tabID: null,
  def_obj: { zindex: null, size: null, font: null, weight: null, stylesheet: null, styles: null}  
};

???

#2

solved.