“Porting” Chrome Addon in Firefox Addon

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Javascript

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Firefox

I have a Chrome Addon and I have to implement the same addon in Firefox.
I saw that the directory structure is different but I'm having some problems with Javascript files.
In which Firefox folder should I put my background.js code??

This is the Chrome Addon directory
Img

And how can I write this Chrome Javascript code for Firefox??

1)var views = chrome.extension.getViews({type: "popup"});
   2)var storage= chrome.storage.local;
   3)alert(chrome.i18n.getMessage("genericError"));
   4)chrome.tabs.onUpdated.addListener(checkForValidUrl);
     chrome.tabs.onRemoved.addListener(resetBackground);
   5)chrome.pageAction.setIcon({path: "images/logo16.png", tabId:firedTabId});
   6)chrome.runtime.onMessage.addListener
   7)bgpage = chrome.extension.getBackgroundPage();

Thank you very much, I really don't know how to do that. If you want I could put the github's Chrome Addon project link.