On Windows, Firefox changed from using its own notification dialogs to sending notifications to Windows. One option would be to switch back, but another one would be to track down why sites or add-ons are generating all those notifications and removing their permission to do that. On the first point: (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button accepting the risk. ''More info on about:config:'' [[Configuration Editor for Firefox]]. ''The moderators would like us to remind you that changes made through this back door aren't fully supported and aren't guaranteed to continue working in the future. Since we have had this setting for a long time and I use it myself, I feel comfortable mentioning it.'' (2) In the search box in the page, type or paste '''alerts.useSystemBackend''' and pause while the list is filtered (3) Double-click the '''alerts.useSystemBackend''' preference to switch the value from true to false. (I don't think you need to change the other one.) On the second point: For a site that generates notifications, you usually can click the permission slider icon in the address bar (it's next to the lock icon) and turn that off. Any progress so far?