Hi there! It's not uncommon to see multiple entries for Firefox in the Task Manager on Windows 11. Each entry represents a different process that Firefox is using, such as tabs, extensions, or background processes. This can make it seem like Firefox is using a lot of memory, but it's actually a design feature to improve performance and stability. To help reduce memory usage, you can try closing unused tabs or disabling unnecessary extensions. You can try restarting your system. Additionally, keeping Firefox updated to the latest version can also help optimize its performance. If you have further questions or need more assistance, feel free to ask.

Hi. You can reduce memory usage by entering about:memory in the address bar and pressing the button labelled Minimize memory usage. It may also help to enter about:serviceworkers and deregister any service workers listed. This article may help.

https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-or-cpu-resources