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Firefox's Task Manager feature shows you performance information, such as what tabs or add-ons are making Firefox slow.

{for not fx104} Firefox's Task Manager feature lets you see which tabs or extensions are using a lot of memory or energy impact. This feature can be useful when diagnosing [[Firefox uses too much memory or CPU resources - How to fix|high memory or CPU usage]] in Firefox. {/for} {for fx104} Firefox has two features that let you see how much memory and CPU resources are being used by tabs, extensions or other processes: Process Manager and Task Manager. These features can be useful when diagnosing [[Firefox uses too much memory or CPU resources - How to fix|high memory or CPU usage]] in Firefox. {/for} __TOC__ {for fx104} =Process Manager= To open the Process Manager, click the menu button [[Image:fx89MenuButton]], click {menu More Tools} and select {menu Task Manager} from the menu. The ''about:processes'' page will open in a new tab. You can also enter '''about:processes''' in the address bar{for fx108} or use the keyboard shortcut {key Shift+Esc}{/for} to open this page. {for not fx109}[[Image:Fx106TaskManager-processes]]{/for}{for fx109}[[Image:Fx113ProcessManager|width=750]]{/for} ==Information in the Process Manager== Information is displayed in multiple columns: *'''Name:''' A list of processes that Firefox is running and ID numbers that identify each process. For technical information about process types, see the [https://firefox-source-docs.mozilla.org/dom/ipc/process_model.html Process Model — Firefox Source Docs] documentation. *'''Memory:''' A rough estimate of how much computer memory each process is using. *'''CPU:''' A rough estimate of how much of your computer's processing power each process is using. *'''[[Image:Fx113ProcessManager-GearIcon]] gear icon:''' This allows you to access more options for a process, such as closing a tab. You can click on the ''Memory'' or ''CPU'' headers to sort the list in descending order. Click again to reverse the order. {note}'''Note:''' The '''Extensions''' process entry shows memory and CPU usage for all extensions, since all extensions share a single content process. To view information for individual add-ons, use the [[#w_task-manager|Task Manager]].{/note} ==Perform actions in the Process Manager== Hovering over an item in the Process Manager can show a profiler icon next to it's name and ID. The action button will also appear on the right side. You can use the profiler [[Image:Fx113ProcessManager-ProfilerIcon]] icon to evaluate a process performance. It will start recording a profile, gathering data from all threads of the process for 5 seconds, then will launch Firefox Profiler in a new tab showing the recorded profile. The action [[Image:Fx113ProcessManager-ActionButton]] button can be used to close a tab, or leave it open but unload its contents and kill associated processes. {/for} =Task Manager= The Task Manager displays useful information about the tabs and extensions actively running on Firefox. {for not fx104} To open the Task Manager, click the menu button [[Image:fx89MenuButton]], click {menu More Tools} and click {menu Task Manager}. The Task Manager ''about:performance'' page will open in a new tab. You can also enter '''about:performance''' in the address bar to open the Task Manager. [[Image:taskmanager_fx68]] {/for} {for fx104} To open the Task Manager, enter '''about:performance''' in the address bar. The Task Manager ''about:performance'' page will open in a new tab. {for not fx109}[[Image:Fx106TaskManager-performance]]{/for}{for fx109}[[Image:Fx109TaskManager-performance]]{/for} {/for} ==Information in the Task Manager== Information is displayed in multiple columns: *'''Name:''' The name of the tabs and extensions currently running within Firefox. Extension IDs will also be included in this column. *'''Type:''' Whether each item is a tab or an add-on. Some tabs have additional subtasks, that may include subframes, trackers or service workers associated with the tab. *'''Energy Impact:''' The CPU processing power being used by each task. Tasks with a higher energy impact will drain your battery quicker and may slow down the performance of your system. *'''Memory:''' The amount of RAM each task is using on your system. You can click on the ''Energy Impact'' or ''Memory'' headers to sort the list in descending order. Click again to reverse the order. ==View subtasks== Some tabs have additional subtasks that can be viewed from the Firefox Task Manager. These may include subframes, trackers or service workers associated with the tab. To view subtasks, select the right-arrow on the left side of the task's name. You can hide the subtasks again by selecting the down-arrow on the left side of the main task's name. ==Perform actions in the Task Manager== Hovering over an item in the Task Manager will show more details about the performance of this tab or extension. The action button will also appear on the right side of the task. The action button can perform the following on: *'''Tab Tasks:''' Close the associated tab. *'''Add-on Task:''' Open the add-on page in a new tab. {note}'''Note:''' Actions cannot be performed on subtasks.{/note}