It looks a "push notification" which could be generated by a website or by an add-on. You can use the Settings page to remove permissions from sites that are currently allowed to send notifications. See: [[Web Push notifications in Firefox]] (the "How do I revoke Web Push permissions for a specific site?" section). If that doesn't help, then one of your add-ons may be to blame. Could be something related to shopping, or it might be a monetization feature for a completely unrelated add-on. Tips below the line. Any progress so far? ---- You can view, disable, and often remove unwanted or unknown extensions on the Add-ons page. Either: * Ctrl+Shift+a (Mac: Command+Shift+a) * "3-bar" menu button (or Tools menu) > Add-ons * type or paste '''about:addons''' in the address bar and press Enter/Return In the left column of the Add-ons page, click Extensions. On the right side, find the "Manage Your Extensions" heading. ''If there is at least one extension before the next heading -- "Recommended Extensions" -- please continue:'' Then cast a critical eye over the list below that heading. Any extensions Firefox installs for built-in features are hidden from this page, so everything listed here is your choice (and your responsibility) to manage. Anything suspicious or that you just do not remember installing or why? If in doubt, disable (or remove). For your privacy and security, don't let mystery programs linger here. Any improvement?