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Chrome Extension, chrome.notification not work

We're developing a web extension. We're actually trying to add some functionalities on the extension such as notifications.
For instance, we don't see any notifications at all, not even in the log console and we can't figure out the problem.
Do you have any ideas ?
Here is our manifest and our background.
Thank you in advance.
{
"description": "truc écolo",
"manifest_version": 2,
"name": "PolNum",
"version": "0.1",
"icons": {
"48": "icons/icon48.png"
},
"permissions": [
"webRequest",
"activeTab",
"http://*/*",
"https://*/*",
"tabs",
"*://*.google.com/",
"storage",
"alarms",
"history",
"notifications"
],
"browser_action": {
"default_popup" :"popup.html",
"default_icon": {
"16": "icons/icon16.png",
"32": "icons/icon32.png"
}
},
"background": {
"scripts": ["background.js"]
}
}
chrome.notifications.create('test', {
type: 'basic',
iconUrl: "icons/icon16N.png",
title: 'Test Message',
message: 'You are awesome!',
priority: 2
});

Can I inject intercom.io using a chrome extension?

I can't seem to inject it through a normal injection.
The code is the standard script of intercom put in an src/inject/inject.js file
Here is my manifest file
{
"name": "CHANGE THIS : Extension boilerplate",
"version": "0.0.1",
"manifest_version": 2,
"description": "This extension was created with the awesome extensionizr.com",
"homepage_url": "http://extensionizr.com",
"icons": {
"16": "icons/icon16.png",
"48": "icons/icon48.png",
"128": "icons/icon128.png"
},
"default_locale": "en",
"background": {
"page": "src/bg/background.html",
"persistent": true
},
"permissions": [
"https://*/*",
" http://*/*"
],
"content_scripts": [
{
"matches": [
"http://*/*", "https://*/*"
],
"js": [
"src/inject/inject.js"
]
}
]
}

How to read all http requests in Chrome Extension?

I want my Chrome Extension to read and display all http requests in alerts. But alerts are not displaying, console is clear with no errors. Here is my code:
chrome.webRequest.onBeforeRequest.addListener(
function(details) {
alert(JSON.stringify(details));
},
{urls: ["<all_urls>"]},
["blocking", "requestBody"]
);
Also my manifest:
{
"manifest_version": 2,
"name": "Some_Name",
"version": "1.2",
"content_scripts": [{"matches": ["<all_urls>","http://*/*", "https://*/*"],"js": ["background.js"]}],
"background": {
"page": "background.html"
},
"permissions": [
"alarms",
"webRequest",
"webRequestBlocking"
],
"browser_action": {
"default_title": "Some extension"
},
"icons": {
"128": "icon.png" }
}

Why after installing Chrome app, it fires on new tab?

I created a Chrome app you can try it here
https://chrome.google.com/webstore/detail/style-scout/chbdclbnkfcocaolknbjmmppendkmebh
but after I install it and I open a new tap the app fires immediately and only for the very first time... why is that happening?
manifest is
{
"background":
{
"scripts": ["background.js"]
},
"browser_action":
{
"default_icon": "icon-128.png",
"default_title": "Style Scout"
},
"content_security_policy": "script-src 'self' https://ssl.google-analytics.com; object-src 'self'",
"name": "Style Scout",
"short_name": "Style Scout – Fonts & Colors Finder",
"description": "Fonts & Colors Finder",
"homepage_url": "https://stylescout.org",
"icons":
{
"16": "icon-16.png",
"48": "icon-48.png",
"128": "icon-128.png"
},
"permissions": ["tabs", "http://*/*", "https://*/*", "storage"],
"version": "0.612",
"manifest_version": 2,
"content_scripts": [
{
"matches": ["<all_urls>"],
"js": ["activate-np-chrome.js"]
}],
"web_accessible_resources": ["np-chrome.js"]
}
and background.js:
chrome.browserAction.onClicked.addListener(function(tab) {
chrome.tabs.executeScript(tab.id, {
file: "np-chrome.js"
})
});
np-chrome.js is the actual full script of my app...

ok I completely removed this part
"content_scripts": [
{
"matches": ["<all_urls>"],
"js": ["activate-np-chrome.js"]
}],
"web_accessible_resources": ["np-chrome.js"]
and now it works, because I didn't know that content_scripts actually inject and fire the script for every single tab ever, whereas i just needed to fire my script when the user clicks my browser button

Chrome extension background.js file reload

EDIT
My chrome extension calling an api service in the background.js file and i can get the data. But after closing the browser window, i cant get the data from the api service in background.js file. It showing null value. When go to the chrome://extensions/ and reload the extension I can get the data.
When close the browser window, the data fetched is being reset and when open the browser, data not fetching. Data can be fetched from the api only after reloading the extension.
Why happening so. Does any one have an idea about this?
This is my manifest.json file
{
"manifest_version": 2,
"icons": {
"16": "images/icon16.png",
"32": "images/icon32.png",
"48": "images/icon48.png",
"128": "images/icon128.png"
},
"name": "Test",
"short_name": "Test",
"description": "Test",
"version": "3.0.0",
"background": {
"scripts": [
"build/background-bundle.js"
]
},
"browser_action": {
"default_popup": "popup.html"
},
"permissions": [
"tabs",
"cookies",
"storage",
"activeTab",
"http://*/",
"https://*/"
],
"content_scripts": [{
"matches": [
"<all_urls>"
],
"js": [
"build/content-bundle.js"
],
"run_at": "document_end"
}],
"options_ui": {
"page": "options.html",
"chrome_style": true
},
"content_security_policy": "script-src 'self' https://www.google-analytics.com/analytics.js https://api.algorithmia.com/v1/algo/algo://nlp/SummarizeURL/0.1.1; object-src 'self'"
}

You can't reload the background file based on anything other than reopening the browser or reloading the extension manually. What you should instead do is have a content script tell background.js to run getTaxonomyList again when the user log in happens.
background.js:
chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
if (request.userLoggedIn) {
getTaxonomyList().done(function(list) {
sendResponse(list);
});
}
})