![Why does Firefox consume a lot of CPU even when closed? I thought an update was in progress, so I let it run for an hour, but it still used 50% CPU. Why does Firefox consume a lot of CPU even when closed? I thought an update was in progress, so I let it run for an hour, but it still used 50% CPU.](https://preview.redd.it/why-does-firefox-consume-a-lot-of-cpu-even-when-closed-i-v0-ouf98z84jlfa1.png?auto=webp&s=b47fdcb20838295963e961c5f7d6e9f4065a5f7c)
Why does Firefox consume a lot of CPU even when closed? I thought an update was in progress, so I let it run for an hour, but it still used 50% CPU.
![Microsoft fixes 5 year old Windows Defender bug that affected Firefox's performance - gHacks Tech News Microsoft fixes 5 year old Windows Defender bug that affected Firefox's performance - gHacks Tech News](https://www.ghacks.net/wp-content/uploads/2023/04/Windows-Defender-Firefox-CPU-usage-before-vs-after-bug-fix.jpg)
Microsoft fixes 5 year old Windows Defender bug that affected Firefox's performance - gHacks Tech News
![Why does Firefox consume a lot of CPU even when closed? I thought an update was in progress, so I let it run for an hour, but it still used 50% CPU. Why does Firefox consume a lot of CPU even when closed? I thought an update was in progress, so I let it run for an hour, but it still used 50% CPU.](https://preview.redd.it/why-does-firefox-consume-a-lot-of-cpu-even-when-closed-i-v0-ouf98z84jlfa1.png?width=640&crop=smart&auto=webp&s=8f784d30eacdcf6d67ffa496d9738c051f1da413)
Why does Firefox consume a lot of CPU even when closed? I thought an update was in progress, so I let it run for an hour, but it still used 50% CPU.
![Why is this firefox process uses so much cpu, If I close it It comes back again after some time : r/firefox Why is this firefox process uses so much cpu, If I close it It comes back again after some time : r/firefox](https://preview.redd.it/uv03vka6yoh91.png?width=640&crop=smart&auto=webp&s=9cb9909c58fab32e782bd15b95246c329064d151)