Mozilla Firefox, Google Chrome and other modern browsers will support so-called push notifications on the desktop in the near future or are already supporting it.
Push notifications allow websites to notify the user even if the site itself is no longer open in the browser. It is a notification system that can be utilized by sites to inform users about new messages or items available on the site among other things.
The system uses servers, maintained by Google or Mozilla depending on platform that interact with these sites and the user's browser.
Mozilla plans to launch Push notifications in Firefox 44. This means that Firefox Nightly and Firefox Developer Edition users can make use of the feature already.
Update: Firefox 44 has been released to the stable channel in the meantime. All recent versions of Firefox support the Push API and therefore also notifications.
Here is how it works on the technical side:
If you allow sites to push notifications to your browser, you may receive notifications at any time from them. In addition, your IP address is known to them which they may use to look up your location.
You may revoke Push notification permissions at any time in Firefox
Turn off notifications in Firefox for the session
It may sometimes be enough to disable notifications in Firefox for the browsing session. An option to do so has been added to the Firefox options.
This suppresses any notifications for the session. The option is unchecked on the next restart of the browser.
Disable Push Notifications completely in Firefox
There is no option to disable Push completely in Firefox's interface. You may ignore the prompts or block sites from displaying push prompts in future sessions but that is about it.
You may however disable it fully in the following way:
Doing so disables Push Notifications in Firefox. You won't receive any more notification prompts from websites supporting the feature.
To undo the change, repeat the process outlined above and make sure that the preference's value is true in the end.
You may find the following list of resources useful for your research
Mozilla Wiki - Firefox Push Notifications page. This, rather technical page informs you about the progress of implementation in Firefox, technical specifications and more concerning Push API and related technologies in the browser.
Mozilla Support - Push Notifications Firefox page. The support page explains what Push Notifications are, and how you control and manage them in the Firefox browser.
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